SPECIAL_K: IndicatorDescriptor = ...

Pring's Special K: twelve rates of change from twelve different horizons, each smoothed and weighted, added into one line. Short-, intermediate- and long-term momentum in a single reading, which is why its turns are read as complete-cycle signals rather than as entries.

Every term has to have a value before the sum does, so the slowest one sets the warmup; the reference itself refuses to run on a chart with fewer than 725 bars.