L'Indicator Designer

On most platforms an Indicator is something you re-declare inline every time you want it. Here it is a first-class artifact with its own page — the Indicator Designer. You define an indicator once, give it a name, and strategies reference it by that name.

Anatomy of an indicator

An indicator has a kind (the calculation — ema, rsi, donchian, vwap, and more), its parameters (an EMA's period, say), and a tag — the name rules use to reach it. In a strategy you might declare ema_fast as an EMA with period 100; every rule then reads {indicator: ema_fast, field: value}.

Fields: one indicator, several outputs

Some indicators output a single number; others output several. An EMA exposes one value. A Donchian channel exposes upper, mid, and lower. The field you pick in a rule selects which output you mean — so the same indicator can drive a breakout rule (against upper) and a pullback trigger (against mid) at once.

Remember what an indicator is not: a prediction. It is a transformation of price that highlights one feature. The What an indicator is lesson makes that case in full — worth re-reading before you start stacking indicators in search of confluence that is really just repetition.