AB=CD

The building block of every harmonic pattern: two equal-length legs around a partial retracement.

Bat

A deep 0.886 completion that lands close to the structure's extreme, letting a trade enter near it with a tight stop just beyond.

Butterfly

An extension pattern that completes beyond the origin, fading exhaustion as price prints a fresh extreme.

Crab

The deepest extension in the family, completing at a 1.618 projection, built for sharp reversals from overshoots.

Cypher

A distinct geometry where C pushes past A, then price retraces 0.786 of that whole move to complete at D.

Deep Crab

A Crab variant with a deeper 0.886 B point, completing at the same 1.618 extension.

Gartley

The original harmonic pattern: a 0.786 retracement completing an XABCD structure, read as an exhausted pullback turning back with the larger trend.

Shark

A five-point structure of two strong extensions into a reaction point where the move is expected to stall.

Three Drives

Three symmetric pushes to a high or low, each separated by a partial pullback, read as a climax.

Day-of-Week Bias

How RTH close-to-close returns differ by weekday and whether any specific day pulls above or below the all-session average.

Inside Day

How often a session contained inside the prior session's range produces a directional breakout the next day.

NR7

How often the narrowest-range session in seven days resolves into a directional breakout the next day.

Opening Drive Failure

How often a strong move in the first 30 minutes of RTH gets fully unwound by the close.

Outside Day

How often the close direction of an engulfing session carries through to the next day.

Pre-Holiday Effect

Whether the session right before a US market holiday produces different RTH returns than a normal day.

Range Breakout Failure

How often a 15-minute close above or below a rolling N-bar range gets unwound within the next two hours.

Santa Rally and January Effect

Whether the late-December rally and early-January push produce different RTH returns than the rest of the year.

Three-Bar Reversal

How often a fourth-bar reversal after three directional sessions actually carries into the next day.

Turn-of-Month Effect

Whether the recurring window around month boundaries produces different RTH returns than the rest of the month.

Volatility Squeeze Break

How often a tightly compressed period of price action resolves into a directional break, and how those breaks behave afterward.

Gap Fill Rate

How often overnight gaps close back to the prior session's close during the following regular trading hours.