Sub-indicators are indicators that are applied to another indicator rather than the three primary pieces of market data from which primary indicators are developed.

The purpose of a sub-indicator is to make interpretation of the primary indicator easier, faster, and far more reliable. 

Sub-indicators reveal patterns of: Harmony, Synchronicity, Convergences, Divergences, Leading Patterns, and Reversal Patterns.

Every trader and investor should know how to use sub-indicators to improve their chart analysis skills.