Reduction
The core technique of repeatedly adding the digits of a number until a single digit remains, stopping early on master numbers.
What it means
Reduction is the engine that powers almost every numerology calculation. You add the digits of a total, then add the digits of that result, and keep going until one digit is left. Numity makes one important exception: it stops at the master numbers 11, 22, and 33 instead of reducing them further. A second detail matters just as much: the two-digit total reached just before the final step is kept, because that is where master numbers and karmic debts (13, 14, 16, 19) are read. The digital root itself is invariant, so where you choose to stop is what gives each method its character.