Crossword Genius

Numbering system using only 1 and 0 (6)

Ross

I believe the answer is:

binary

(Other definitions for binary that I've seen before include "Involving two things" , "Two-star system" , "Using the digits 0 and 1" , "A system of two stars" , "Double (star)" .)

I've seen this clue in The Guardian.
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