Mammals depicted in Linear B script including male and female characters Female characters are differentiated by an inverted letter V.

More evidence that the “V” shape means “female”— this time in Linear B (circa 1,450 BC)

Script depictions are from a no-longer functional website, but you can find equivalent source material here:

The vagina is the most consistently represented concept in all writing across all literate cultures. Female mammals are the basis of written language.