Fractal Indicator
The Fractal Indicator, developed by Bill Williams, identifies local turning points in price by marking bars where a high or low is the extreme of a five-bar sequence — two bars with lower highs on each side for an up fractal, or two bars with higher lows on each side for a down fractal.
Bill Williams introduced the Fractal Indicator as part of his trading system described in the books Trading Chaos (1995) and New Trading Dimensions (1998). Williams borrowed the concept of fractals from Benoit Mandelbrot's mathematics of irregular geometric self-similarity: at every scale, market price structures repeat. For practical charting purposes, Williams operationalised 'fractal' as a specific five-bar pattern that identifies a local price extreme.
An up fractal forms when the middle bar of a five-bar sequence has the highest high of all five bars — that is, the two bars immediately to the left and the two bars immediately to the right both have lower highs. This bar is marked with an up arrow above it. A down fractal forms when the middle bar has the lowest low of the five-bar sequence — the two bars on each side have higher lows. This bar is marked with a down arrow below it.
Fractals serve multiple functions within the Williams trading system. First, they define structural swing highs and swing lows, providing a mechanical basis for identifying trend direction: a series of higher up fractals and higher down fractals defines an uptrend; lower up fractals and lower down fractals define a downtrend. Second, fractals are used as stop-loss reference points — the most recent down fractal below the current price is commonly used as the initial stop for long positions in the Williams method.
Fractals interact with two other Williams indicators — the Alligator (three smoothed moving averages) and the Awesome Oscillator — to generate trading signals. A key rule in the Williams system is that fractal breakout signals above or below the Alligator's 'mouth' (the separation between the three Alligator lines) are considered more reliable than fractals generated while the Alligator lines are intertwined (sleeping). Trading fractals against the Alligator direction is specifically discouraged within the system.
In Indian markets, the Fractal Indicator is available as a standard tool on most charting platforms including TradingView, Kite, and Amibroker. It is most effectively used on daily charts of liquid NSE stocks where five-bar patterns are not obscured by extreme low-volume noise.