# Day-type Taxonomy Day-type Taxonomy is an indicator on [Vela](https://vela.luxalgo.com/chart), our next-generation charting platform, written in Pine Script®. Day-type Taxonomy classifies every intraday session against the Market Profile day types (normal, normal variation, trend, double-distribution trend, neutral, neutral extreme, and non-trend) from its initial balance and range extensions. It labels the developing type live, stamps the final type at each session close, and tallies type frequencies in a dashboard. - Indicator in the LuxAlgo Library, by LuxAlgo, published Jun 4, 2026. - Access: free. - Concepts: [Day-type Taxonomy](https://www.luxalgo.com/library/concept/day-type-taxonomy/) (primary), [Auction Market Theory](https://www.luxalgo.com/library/concept/auction-market-theory/) - Open on Vela: https://vela.luxalgo.com/chart?pineScriptCodeId=dn16ou7ytsvib4vd4k775fji - Page: https://www.luxalgo.com/library/indicator/day-type-taxonomy/ **Day-type Taxonomy** turns the Market Profile [day-type taxonomy](https://www.luxalgo.com/library/concept/day-type-taxonomy/) into a live session classifier, the first of its kind in the Library. Each day the initial balance is boxed and carried across the session, dashed levels mark the trend threshold beyond each extreme, and a developing-type label updates live; the close stamps the final classification with its extension in IB widths, and a statistics table counts each type. ## How to Trade the Day-type Taxonomy? - **Trend Day Developing**: one-sided extension reached the trend threshold with price holding near the extreme. Joining strength beats fading. - **Both-side extension**: extension beyond both IB extremes defines neutral conditions; the close separates neutral from neutral extreme. - **No extension**: the initial balance contains the session. Rotational tactics dominate. On most markets trend days are a minority, the case for rotation as the default. Early reads are revised often, so let a session mature. Alerts cover extensions, a developing trend day, and every final classification. ## Day-type Taxonomy Settings - **Initial Balance Length (minutes)** (default 60): the canonical first hour. - **Min Range Extension (% of IB width)** (default 15) and **Trend Threshold (x IB width)** (default 1): the smallest extension that counts, and the multiple reaching trend-day magnitude. - **Close-at-Extreme Zone (%)** (default 25): range share counting as an extreme close. - **Detect Non-Trend Days** (default on), **Non-Trend Range (x average)** (default 0.6), **Average Range Lookback (sessions)** (default 10): the narrow-day add-on. - **Detect Double-Distribution Trend Days** (default on): splits two-distribution trend days. - Display: **Developing Day Type Label**, **Final Day Type Labels**, **Initial Balance Zone**, **Trend Extension Levels**, **Day-Type Statistics** (all default on), **Shade Initial Balance Period** (default off), plus table position, size, colors. ## Frequently Asked Questions ### How does this relate to the TPO Profile? The [TPO Profile](https://www.luxalgo.com/library/indicator/tpo-profile/) draws the full time-price distribution; the taxonomy compresses each session into one tactical label built from the initial balance. Many traders run both: structure from the profile, tactics from the day type. ### Which chart settings does it need? An intraday timeframe that divides the IB length evenly: 5-, 15-, or 30-minute bars for the default 60-minute balance. Non-intraday charts and bars longer than the initial balance get a warning instead of a guess. ### Why did the developing label change mid-afternoon? A fresh extension, a failed one, or a drifting close can regrade the session at any point. Only the close makes the type certain. Final stamps and session-classified alerts wait for it. ## Related indicators - [TPO Profile](https://www.luxalgo.com/library/indicator/tpo-profile/) (Auction Market Theory): markdown at https://www.luxalgo.com/library/indicator/tpo-profile.md - [Balance vs Imbalance](https://www.luxalgo.com/library/indicator/balance-vs-imbalance/) (Auction Market Theory): markdown at https://www.luxalgo.com/library/indicator/balance-vs-imbalance.md - [Initial Balance Breakout Signals](https://www.luxalgo.com/library/indicator/initial-balance-breakout-signals/) (Initial Balance): markdown at https://www.luxalgo.com/library/indicator/initial-balance-breakout-signals.md - [Profile Shape Taxonomy](https://www.luxalgo.com/library/indicator/profile-shape-taxonomy/) (Auction Market Theory): markdown at https://www.luxalgo.com/library/indicator/profile-shape-taxonomy.md - [80% Rule](https://www.luxalgo.com/library/indicator/80-percent-rule/) (Volume & Order Flow): markdown at https://www.luxalgo.com/library/indicator/80-percent-rule.md - [Auction Failure](https://www.luxalgo.com/library/indicator/auction-failure/) (Volume & Order Flow): markdown at https://www.luxalgo.com/library/indicator/auction-failure.md - [Value Migration](https://www.luxalgo.com/library/indicator/value-migration/) (Volume & Order Flow): markdown at https://www.luxalgo.com/library/indicator/value-migration.md - [One-timeframing](https://www.luxalgo.com/library/indicator/one-timeframing/) (Volume & Order Flow): markdown at https://www.luxalgo.com/library/indicator/one-timeframing.md --- Source: https://www.luxalgo.com/library/indicator/day-type-taxonomy/ (LuxAlgo Library). Free to use with attribution: https://www.luxalgo.com/library/license/