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Butts, breasts, and genitals now explicitly allowed on Elon Musk’s X
(arstechnica.com)
This is a most excellent place for technology news and articles.
Cis is just a Latin prefix that means "on the same side of", and is the opposite of trans, which means "on the other side of".
I.e. your gender identity is the same as what you were assigned at birth, therefore cis.
Another prefix that would fit well, as it means "the same as/equal/alike" would be homo.
Perhaps we should indulge Elon's wishes and instead use the term homogender or homo, for short. I'm sure he'd love that.
I'm still sad that we didn't use 'Ultra', which means 'beyond' or 'on the far side of'. Huge missed opportunity to be called Ultragender instead.