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Candlestick analysis

Block-Based Trend Breakout (YTK/DTK) – v1📌 Overview Block Trend Breakout (YTK/DTK) is a lightweight, rule-based indicator that detects potential trend reversals or volatility bursts by tracking breakouts of key structural support/resistance levels — derived from block-wise trend patterns. The logic is simple yet effective: if a trend has been confirmed across multiple blocks (custom-length bar groups), and the price breaks its own structural boundary, a potential reversal or volatility signal is triggered. 🟥 YTK (Uptrend Breakdown) → Price breaks below the lowest low of the most recent block in an uptrend. 🟩 DTK (Downtrend Breakout) → Price breaks above the highest high of the most recent block in a downtrend. 🔍 How It Works Block Construction: User-defined bar groups (e.g., 6 bars on a 4H chart = 24H blocks). Trend Validation: At least N consecutive blocks must show higher highs/lows (uptrend) or lower highs/lows (downtrend). Breakout Test: If the current bar violates the structural limit (MR block high/low), the corresponding signal is plotted. 📉 This logic identifies weakening trends or failed momentum, often preceding reversals or volatility expansions. ⚙️ Features Adjustable block size and trend confirmation count Option to use only closed bars (to reduce repaint risk) Inclusive mode for “<= / >=” logic Visual signals: MR Block high/low levels Trend-colored bars Arrows for YTK (🔻) and DTK (🔺) Built-in alerts for automated strategies 🎯 Use Cases Spotting fakeouts and false breakouts Identifying trend exhaustion before reversal Confirming structural support/resistance breaks Visual tool for discretionary traders Signal generator for automated systems 💬 Feedback & Contributions This script is open-source and community-driven. We actively welcome feedback, ideas, improvements, forks, and questions. 📩 Contact for collaboration or discussion: 📧 senbrke@gmail.com
Chỉ báo Pine Script®
bởi senbrke
FVG SuiteSupercharge your charts with FVG Suite! Detect Smart Money structures, Fair Value Gaps, and key Multi-Timeframe levels—all in one powerful indicator. Perfect for both intraday and swing traders. ⚡ Highlights: 📈 Smart Money Structure: BoS & CHoCH signals with customizable colors and sensitivity. 💎 Fair Value Gaps: Bullish & Bearish FVGs with filters, max extension, and automatic cleanup. 🕒 Multi-Timeframe Levels: Daily, Weekly, and Monthly Highs & Lows with solid/dashed/dotted lines. 📊 Volume Activity: Real-time 4H & 24H volume analysis in a neat table. 🎨 Fully Customizable: Colors, transparency, and labels for a clean, easy-to-read chart. Make smarter trade decisions with clear market structure insights and gap detection! 🚀
Chỉ báo Pine Script®
bởi NovaTradeStar
Volume Heat ZoneVolume Zones Indicator This Pine Script creates a volume-based zone analysis tool for TradingView. Function: Divides the price range (high to low) into 20 levels over a 100-candle lookback period Measures volume activity at each price level Draws boxes at levels with above-average volume (1.5x threshold) Key Settings: Lookback Period (100): Number of candles analyzed Price Levels (20): Price range subdivisions Volume Threshold (1.5): Minimum volume multiplier for zones Candle Offset (1): Excludes current candle from analysis Projection Bars (10): Extends boxes 10 bars into the future How it works: The indicator identifies price levels where significant trading volume occurred historically, highlighting potential support/resistance zones. Boxes are redrawn on each confirmed candle, showing dynamic volume concentration areas that traders can use for entry/exit decisions.
Chỉ báo Pine Script®
bởi trading_zone42
Advanced Pattern Detection System [50+ Patterns]【Advanced Pattern Detection System - Auto-detects 50+ Chart Patterns】 Introducing the most powerful pattern detection indicator for TradingView! ◆ What is this? An automated tool that finds and displays over 50 chart patterns on your charts. It detects all the patterns professional traders use - Double Tops, Triangles, Head & Shoulders, and more - all in ONE indicator. ◆ Main Features ・Detects 50+ patterns in real-time ・Shows visual explanation of WHY each pattern was identified ・Automatically calculates theoretical target prices ・Displays confidence levels in % (60-95%) ・Choose panel position from 9 locations ・Works on all timeframes (1min to Monthly) ◆ Detectable Patterns 1. Classic Patterns (Double Top/Bottom, Head & Shoulders, etc.) 2. Triangle Patterns (Ascending, Descending, Symmetrical, Expanding) 3. Continuation Patterns (Flags, Pennants, Wedges, etc.) 4. Harmonic Patterns (Gartley, Butterfly, Bat, etc.) 5. Price Action (Pin Bar, Engulfing, Hammer, etc.) 6. Special Patterns (Cup & Handle, V-formations, etc.) ◆ What Makes It Different ・Not just detection - shows the reasoning behind it ・Auto-draws pivot points and necklines ・Displays target prices with % gain/loss from current price ・Detects multiple patterns simultaneously, sorted by confidence ・Available in both Japanese and English versions ◆ Perfect For ✓ Anyone tired of using multiple indicators ✓ Beginners wanting to learn pattern trading ✓ Traders who don't want to miss entry points ✓ Those looking to improve discretionary trading accuracy ◆ How to Use (Easy 3 Steps) 1. Open TradingView and paste code in Pine Editor 2. Click "Add to Chart" 3. Enable only the patterns you need in settings ◆ Color Meanings Green → Bullish potential (Buy signal) Red → Bearish potential (Sell signal) Yellow → Neutral direction (Wait and see) ◆ Recommended Settings Scalping: Detection period 20, Sensitivity 0.0025 Day Trading: Detection period 50, Sensitivity 0.002 Swing Trading: Detection period 100, Sensitivity 0.0015 ◆ Real Trading Example "Detects Double Bottom → 85% confidence → Enter on neckline break → Take profit at displayed target price" This is how you can use it in practice. ◆ Important Notes ・This is an analysis tool, not investment advice ・Always combine with other indicators ・Always set stop losses ・Practice on demo account before live trading ◆ Performance If running slow, turn OFF unused pattern categories. Reducing max display count to 3 also helps. ◆ Summary This single tool provides functionality that would normally require multiple paid indicators (worth $100-200 total). It's the ultimate pattern detection system recommended for all traders, from beginners to professionals. Give it a try if interested! Feel free to ask questions in the comments.
Chỉ báo Pine Script®
bởi Hunk77
7
CheckList คนใจร้อนThink of this indicator as your trend sanity check. It won’t tell you what to do—but it’ll help you see the bigger picture before you act. Your risk is your responsibility. No shortcuts, no excuses—just disciplined decisions and solid money management. Built for traders who value structure over impulse. This tool helps you stay aligned with your plan, not your emotions. Use it to reinforce discipline, not override it.
Chỉ báo Pine Script®
bởi PierreBudd
Ai Golden Support and Resistance Adaptive Support & Resistance (ADR-scaled ABCD + Breakout/Retest Zones) What it does This indicator detects actionable support/resistance zones from swing structure and breakout events, then keeps each zone active until it’s invalidated by price. It adapts zone sensitivity using Average Daily Range (ADR) so the same rules scale across symbols and vol regimes. Core Logic (high level) Swing & ABCD pattern seed Detects alternating pivots (high–low–high–low or low–high–low–high) using a user-selected lookback. Validates basic AB–BC–CD proportions: BC must retrace a portion of AB; CD must extend BC within a set range. From a valid sequence, sets a candidate level (top for bearish, bottom for bullish). Breakout confirmation A level becomes confirmed when price closes beyond it (crossover/crossunder). On confirmation, the script draws a dotted reference line and records how many bars elapsed from the seed pivot to breakout. That count defines the lookback window used for local extremes. Zone construction Supply (bearish): builds a box around the most recent local range near the bearish seed; Demand (bullish): builds a box around the most recent local range near the bullish seed. Each zone’s height is derived from nearby extremes and the seed swing, so boxes reflect local structure rather than fixed pip widths. Volatility normalization (ADR%) ADR is computed from daily candles. The Risk Profile input (“High/Medium/Low”) scales required move sizes using ADR%, and adjusts pivot sensitivity (fewer/more bars). Higher risk → more sensitive (smaller ADR %, tighter pivot lookback). Lower risk → stricter filters (larger ADR %, wider pivot lookback). Explosive-move filter (streak logic) Searches the seeded lookback for consecutive same-color candles (config via the risk profile). Requires the cumulative % move of that streak to exceed an ADR-scaled threshold. When found, the zone is tagged as originating from an “explosive” move (potentially higher reaction probability). Zone persistence & invalidation Zones persist and auto-extend to the right until invalidated. Invalidation occurs when price closes through a rule-based threshold derived from the seed structure (stored per zone). Once invalidated, the zone is marked inactive and stops updating. Inputs & Controls Risk Profile: High / Medium / Low (sets pivot lookback, streak length, and ADR% thresholds). Labels & Visuals: Toggle labels and level lines; set line width. Colors/Boxes: Supply (red), Demand (green); dotted breakout references. No broker/session settings are required; the script adapts per symbol via ADR. On-Chart Elements Dotted breakout lines at confirmed levels (with measured bars-to-breakout). Supply/Demand boxes that extend until invalidation. Optional labels for clarity; minimal clutter by default. How to Use Context: Use higher-TF context for bias; apply zones on your trading TF. Confluence: Combine zones with your own triggers (structure breaks, rejection wicks, momentum shifts). Invalidation: If price closes beyond a zone’s invalidation threshold, treat that zone as inactive. Sensitivity: If too many zones appear, switch to Medium/Low Risk (stricter ADR% & pivots); if too few, use High Risk. Notes & Limitations Logic is rule-based; there is no machine learning. Daily ADR is computed from D timeframe, so intraday charts inherit daily volatility context. Results vary by symbol and timeframe; validate settings per market. This is an indicator (no orders or P/L).
Chỉ báo Pine Script®
bởi GoldenCryptoSignals
多因子交易系统该指标是一个多功能的技术分析工具，结合了以下核心模块：线性回归通道：通过计算不同周期（短期、中期、长期）的线性回归通道，识别价格趋势和关键价格水平。 范围检测：基于加权移动平均和自适应 ATR 检测价格横盘整理区域。 支撑阻力识别：通过摆动点和线性回归通道的上下轨自动识别关键支撑和阻力位，并存储在矩阵中。 交易信号生成：结合通道突破、范围突破和支撑阻力突破生成多头/空头信号，并通过成交量过滤和冷却期机制优化信号质量。 可视化：提供丰富的图形化输出，包括通道线、关键位线、范围框、信号标记和仪表盘。 警报系统：为突破、回踩、关键位触及等事件设置了多种警报条件。 指标的目标是帮助交易者识别趋势、横盘、关键价格水平，并提供可操作的交易信号，适合日内交易、波段交易等多种场景。 This indicator is a multifunctional technical analysis tool that combines the following core modules: Linear Regression Channel: By calculating the linear regression channels of different periods (short-term, medium-term, long-term), price trends and key price levels are identified. Range detection: Based on weighted moving average and adaptive ATR, detect price sideways consolidation areas. Support resistance identification: Key support and resistance positions are automatically identified through swing points and the upper and lower tracks of the linear regression channel, and stored in a matrix. Trading signal generation: Combining channel breakthrough, range breakthrough, and support resistance breakthrough to generate long/short signals, and optimizing signal quality through volume filtering and cooling off mechanism. Visualization: Provides rich graphical output, including channel lines, keylines, range boxes, signal markers, and dashboards. Alarm system: Multiple alarm conditions are set for events such as breakthroughs, retracements, and key position touches. The goal of the indicator is to help traders identify trends, sideways movements, key price levels, and provide actionable trading signals, suitable for various scenarios such as intraday trading and band trading.
Chỉ báo Pine Script®
bởi ziquejie
P/B Ratio (Per Share) vs Median + Bollinger Band- 📝 This indicator highlights potential buying opportunities by analyzing the Price-to-Book (P/B) ratio in relation to Bollinger Bands and its historical median. - 🎯 The goal is to provide a visually intuitive signal for value-oriented entries, especially when valuation compression aligns with historical context. - 💡 Vertical green shading is applied when the P/B ratio drops below the lower Bollinger Band, which is calculated directly from the P/B ratio itself — not price. This condition often signals the ticker may be oversold. - 🟢 Lighter green appears when the ratio is below the lower band but above the median, suggesting a possible shorter-term entry with slightly more risk. - 🟢 Darker green appears when the ratio is both below the lower band and below the median, pointing to a potentially stronger, longer-term value entry. - ⚠️ This logic was tested using 1 and 2-day time frames. It may not be as helpful in longer time frames, as the financial data TradingView pulls in begins in Q4 2017. - ⚠️ Note: This script relies on financial data availability through TradingView. It may not function properly with certain tickers — especially ETFs, IPOs, or thinly tracked assets — where P/S ratio data is missing or incomplete. - ⚠️ This indicator will not guarantee successful results. Use in conjunction with other indicators and do your due diligence. - 🤖 This script was iteratively refined with the help of AI to ensure clean logic, minimalist design, and actionable signal clarity. - 📢 Idea is based on the script "Historical PE ratio vs median" by haribotagada - 💬 Questions, feedback, or suggestions? Drop a comment — I’d love to hear how you’re using it or what you'd like to see changed.
Chỉ báo Pine Script®
bởi traceockinga
P/E Ratio vs Median + Bollinger Band- 📝 This indicator highlights potential buying opportunities by analyzing the Price-to-Earnings (P/E) ratio in relation to Bollinger Bands and its historical median. - 🎯 The goal is to provide a visually intuitive signal for value-oriented entries, especially when valuation compression aligns with historical context. - 💡 Vertical green shading is applied when the P/E ratio drops below the lower Bollinger Band, which is calculated directly from the P/E ratio itself — not price. This condition often signals the ticker may be oversold. - 🟢 Lighter green appears when the ratio is below the lower band but above the median, suggesting a possible shorter-term entry with slightly more risk. - 🟢 Darker green appears when the ratio is both below the lower band and below the median, pointing to a potentially stronger, longer-term value entry. - ⚠️ This logic was tested using 1 and 2-day time frames. It may not be as helpful in longer time frames, as the financial data TradingView pulls in begins in Q4 2017. - ⚠️ Note: This script relies on financial data availability through TradingView. It may not function properly with certain tickers — especially ETFs, IPOs, or thinly tracked assets — where P/S ratio data is missing or incomplete. - ⚠️ This indicator will not guarantee successful results. Use in conjunction with other indicators and do your due diligence. - 🤖 This script was iteratively refined with the help of AI to ensure clean logic, minimalist design, and actionable signal clarity. - 📢 Idea is based on the script "Historical PE ratio vs median" by haribotagada - 💬 Questions, feedback, or suggestions? Drop a comment — I’d love to hear how you’re using it or what you'd like to see changed.
Chỉ báo Pine Script®
bởi traceockinga
P/S Ratio vs Median + Bollinger Band- 📝 This indicator highlights potential buying opportunities by analyzing the Price-to-Sales (P/S) ratio in relation to Bollinger Bands and its historical median. - 🎯 The goal is to provide a visually intuitive signal for value-oriented entries, especially when valuation compression aligns with historical context. - 💡 Vertical green shading is applied when the P/S ratio drops below the lower Bollinger Band, which is calculated directly from the P/S ratio itself — not price. This condition often signals the ticker may be oversold. - 🟢 Lighter green appears when the ratio is below the lower band but above the median, suggesting a possible shorter-term entry with slightly more risk. - 🟢 Darker green appears when the ratio is both below the lower band and below the median, pointing to a potentially stronger, longer-term value entry. - ⚠️ This logic was tested using 1 and 2-day time frames. It may not be as helpful in longer time frames, as the financial data TradingView pulls in begins in Q4 2017. - ⚠️ Note: This script relies on financial data availability through TradingView. It may not function properly with certain tickers — especially ETFs, IPOs, or thinly tracked assets — where P/S ratio data is missing or incomplete. - ⚠️ This indicator will not guarantee successful results. Use in conjunction with other indicators and do your due diligence. - 🤖 This script was iteratively refined with the help of AI to ensure clean logic, minimalist design, and actionable signal clarity. - 📢 Idea is based on the script "Historical PE ratio vs median" by @haribotagada - 💬 Questions, feedback, or suggestions? Drop a comment — I’d love to hear how you’re using it or what you'd like to see changed.
Chỉ báo Pine Script®
bởi traceockinga
MasterClass — FU + AFU (Attempted FU) • with impulse filterThis indicator automatically detects and displays: FU (Failure/False Breakout) — classic “bank candles”: 🟩 Green diamond below the bar — FU bullish (liquidity taken below, strong move upward). 🟥 Red diamond above the bar — FU bearish (liquidity taken above, reversal downward). AFU (Attempted FU) — manipulation candles, when the market attempts to sweep liquidity but does not form a full FU: 🔵 Blue circle above the bar — AFU sell-side (attempted liquidity grab above). 🔵 Blue circle below the bar — AFU buy-side (attempted liquidity grab below). 🔹 This indicator helps traders: Spot liquidity grabs and manipulations. Identify key entry and reversal points. Works on any timeframe and any instrument (Forex, Crypto, Stocks).
Chỉ báo Pine Script®
bởi B1ssnn
1
Overlay Candles (Multi-TF, right side projection)This script overlays candles from a custom selectable timeframe (5m to 1M) on the right side of the chart as projections. It helps visualize and compare the ongoing price action with the last higher-timeframe candles without switching chart intervals. Features: Choose timeframe for overlay candles (5m, 15m, 1H, 4H, 1D, 1W, 1M). Adjustable number of candles to display (1–8). Fixed candle width (in bars) and configurable gap between candles. Custom colors for bullish and bearish candles. Adjustable wick and border thickness (px). Candle borders drawn with four lines to ensure visibility at all zoom levels. Use cases: Multi-timeframe price action analysis. Visualizing higher-timeframe structure alongside lower-timeframe trading. Educational / visual aid for understanding candlestick context.
Chỉ báo Pine Script®
bởi toratorator
Equities OpenThe Equities Open indicator makes it easy to spot the highest and lowest prices during the equities open or a customizable time you choose. It draws lines to show the high and low points and extends them across the chart to a time you pick, such as 3:00 PM that same day. A shaded box highlights the price range during that session. You can customize things such as the session time, timezone, line thickness, colors, and choose if you want the shaded box to show up. It’s built to run smoothly and works best for charts with short timeframes (up to 59 minutes). Perfect for traders who want to focus on key price levels set during pre-market hours!
Chỉ báo Pine Script®
bởi ContrerazJ03
1
ICT KEY LEVELS (L3J)📊 Overview The ICT KEY LEVELS (L3J) indicator is a tool designed to automatically identify and display key levels based on Inner Circle Trader (ICT) concepts. This indicator combines session-based levels with multi-timeframe highs/lows analysis to provide traders with critical price zones for decision-making. Developed by L3J - This indicator can be used in conjunction with other indicators I have developed for enhanced market analysis. 🎯 Key Features Session-Based Levels - Previous Day High/Low (PDH/PDL): Automatically identifies and displays the previous trading day's high and low levels - Asian Session Levels: Tracks high and low during Asian trading hours (20:00-03:00 GMT+4) - European Session Levels: Captures London session high and low levels (03:00-08:30 GMT+4) Multi-Timeframe Analysis - H1 Pivot Levels: Identifies 2-candle reversal patterns on 1-hour timeframe - H4 Pivot Levels: Detects 4-hour pivot points using advanced pattern recognition - Smart Visibility: Levels are only shown on appropriate timeframes (H1 levels on H1, H4 levels on H4) Advanced Features - Priority System: Automatically hides overlapping levels based on importance (Previous Day > Sessions > H4 > H1) - Dynamic Labels: Real-time labels that update with price action - Intelligent Cleanup: Removes crossed or outdated levels to maintain chart clarity - Customizable Anchoring: Choose between precise timestamp anchoring or candle middle anchoring - Performance Optimized: Built with efficient code structure for smooth chart performance ⚙️ Configuration Options Note: Currently, the user interface settings are displayed in French. This will be updated to English in a future version. General Settings - Timezone: Configurable timezone for session calculations (default: GMT+4) - Trading Days: Number of trading days to analyze (1-20 days) - Extension: Right extension length for level lines - Anchoring Mode: Precise timestamp or candle middle anchoring Visual Customization Each level type (Asia, Europe, Previous Day, H1, H4) includes: - Color Selection: Separate colors for highs and lows - Line Styles: Solid, Dotted, or Dashed lines - Line Width: Adjustable thickness (1-4 pixels) - Show/Hide Toggle: Individual control for each level type 🕒 Session Times - Trading Day: 18:00-16:00 (CME session) - Asian Session: 20:00-03:00 GMT+4 - European Session: 03:00-08:30 GMT+4 All times are configurable and timezone-aware 📈 How It Works Level Detection 1. Session Levels: Continuously tracks price action during specific trading sessions 2. Pivot Detection: Uses 2-candle reversal patterns (bullish then bearish for highs, bearish then bullish for lows) 3. Multi-Timeframe Data: Requests higher timeframe data for H1 and H4 analysis Smart Management - Automatic Cleanup: Removes levels that have been crossed or are too old - Priority Filtering: Hides duplicate levels based on importance hierarchy - Dynamic Updates: Real-time adjustment of level positions and labels 🎨 Visual Elements - Horizontal Lines: Extend from level creation point to the right - Dynamic Labels: Show level type and session information - Color Coding: Different colors for each session and timeframe - Transparency: Automatically hides overlapping or less important levels 🔧 Technical Specifications - Pine Script Version: v6 - Chart Overlay: True - Max Lines: 500 - Max Labels: 50 - Performance: Optimized with intelligent memory management 📋 Usage Tips 1. Best Timeframe: Works on all timeframes, but H1 and lower provide optimal detail 2. Combine with Price Action: Use levels as confluence zones for entry/exit decisions 3. Risk Management: Levels can serve as stop-loss and take-profit targets 4. Market Structure: Helps identify key support/resistance in market structure analysis 🔄 Compatibility This indicator is designed to work alongside other L3J indicators for comprehensive market analysis. 📞 Support & Updates For questions, suggestions, or updates, please contact L3J through TradingView messaging. --- Disclaimer : This indicator is for educational and analysis purposes. Always practice proper risk management and never risk more than you can afford to lose. Version: 1.0 Author: L3J Last Updated: 30/08/2025
Chỉ báo Pine Script®
bởi L3J999
Swing Highs/Lows & Candle Patterns[LuxAlgo] [Filtered]Swing Highs/Lows & Candle Patterns - Tweaked Version This indicator is a customized and enhanced version of LuxAlgo’s original Swing Highs/Lows & Candle Patterns indicator. It identifies and labels critical swing high and swing low points to help visualize market structure, alongside detecting key reversal candlestick patterns such as Hammer, Inverted Hammer, Bullish Engulfing, Hanging Man, Shooting Star, and Bearish Engulfing. With added options to selectively display only Lower Highs (LH) and Higher Lows (HL), this tweaked version offers greater flexibility for traders focusing on specific market dynamics. Users can also customize the lookback length and label styling to fit their preferences. Credit to LuxAlgo for the original concept and foundation of this powerful tool, which this script builds upon to support more tailored technical analysis. Ideal for swing traders and technical analysts seeking improved entry and exit signals through a combination of price swings and candlestick pattern recognition.
Chỉ báo Pine Script®
bởi ryanjoy
KING4R_swingGeneral This script is called "KING4R_swing", designed to identify high-probability swing trading entries based on technical setups. It overlays the chart and uses conditions based on volume, EMAs, SPY index trend, and price structure. Main Features User Options: Enable/disable SPY EMA conditions. Show/hide checklist and final message. Adjust label positions (vertical/horizontal). Local EMAs: Calculates 13-EMA and 48-EMA on the current symbol. Flags whether EMA13 is above EMA48 and whether price is above EMA48. Volume Spike Detection: Searches for unusual volume spikes in the last 30 candles. Then checks 60 candles after the spike for either: Lateral movement (no new lows). Higher lows (suggesting a change in structure). Visual Tags: When a volume spike is detected, it adds: “📦 Post-volume Lateral” label if price goes sideways. “📈 Structure Change” if higher lows are confirmed. SPY Conditions: Pulls EMAs from SPY on the daily timeframe. Two optional conditions: EMA13 > EMA48 and EMA8 > EMA21. Stopping Volume: Checks if there's stopping volume in the last 30 candles (volume 1.5x above average). Checklist + Scoring: Assigns up to 6 points based on: EMA13 > EMA48 Lateral structure after high volume Price above EMA48 Stopping volume SPY EMA13 > EMA48 SPY EMA8 > EMA21 Each condition adds 1 point. Dynamic Labels: Shows a red checklist, a final message with score, and a warning (“NO SETUP, NO TRADE”). If score is 6/6, shows a 🚀 rocket icon above the bar. Alert: Triggers an alert when score = 6/6, indicating a possible high-probability entry.
Chỉ báo Pine Script®
bởi TEAMSPY-1