Noun
vav (plural vavs)
The sixth letter of the Hebrew alphabet, ו.
One must be careful with regard to the form of the letters, so that a yud will not resemble a vav, nor a vav a yud; a kaf should not resemble a beit, nor a beit a kaf; a dalet should not resemble a resh, nor a resh a dalet. Maimonides
And so out of the various vav variants in the Mediterranean world, the letter F entered the Roman alphabet attached to a sound which its antecedents in Greek and Etruscan did not have. Source: Internet
Note 4: The letter ו (vav) is used since it can only be represented by that letter. Source: Internet
This form itself is not historically attested in Greek inscriptions, but the existence of the name can be inferred from descriptions by contemporary Latin grammarians, who render it as vav. Source: Internet