Expression Number

Computed from every letter of your full birth name; said to describe your natural 'toolkit'. This is where the two systems disagree.

Each letter is assigned a number and the whole name is summed and reduced. Because the Pythagorean and Chaldean systems map letters differently, your Expression number is usually different in each — we show both, side by side. That disagreement is the honest part: it makes plain that you are looking at a convention, not a measurement.

Not: Not a fixed fact about you. It changes with which name you use — birth certificate, nickname, or married name — and with which system you pick.

A result that depends entirely on an arbitrary choice of name and system is not measuring anything about you. Reflection only.