Assigned Sex at Birth
Noun
The sex (male, female, intersex) assigned to a child at birth, most often based on the child's external anatomy. Also referred to as birth sex, natal sex, biological sex, or sex.
Other examples: AFAB (assigned female at birth), AMAB (assigned male at birth).
Note: It is not valid to use “biology” or “science” to claim assigned sex at birth and/or gender are a fixed, concrete concept and/or binary. Science favors the fact that sex and gender are more complicated and involve much more than one’s sexual organs.
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Adapted from The Fenway Institute and informed by Stop Using Phony Science to Justify Transphobia - Scientific American Blog Network