1986, James O. Hicks, Information Systems in Business: An Introduction (page 201)
Thus digital computers operate directly with digits either at the bit level, which is short for binary digit, or at the byte level where a nonbinary digit such as a decimal number or alphabetic character is represented.
2002, Terry L. M. Bartelt, Digital Electronics: An Integrated Laboratory Approach (page 112)
The most common type of encoder is one that converts a nonbinary number system into an equivalent binary system.
2013, Kim Cook, "This thing called gender", Up Close and Personal, page 85:
I'm expected to live in a world where (..) forms have no or few options for non-binary people, where finding a GP who understands my non-binary needs and identity is a challenge.
puhekieltä Something which is not a binary(gloss).
1994 June 7, "Zhar", Dont Post Non-Binaries In alt.binaries.doom, alt.games.doom, Usnet'':
Please don't post non-binaries into alt.binaries.doom. Pretty please.