Mark E. Shoulson wrote:

> Etymologically, the Hebrew "vav" (originally "waw," like it is in
> Arabic) is indeed cognate to digamma. However, since digamma dropped
> out of Greek, the sound it represents, /w/, is now written as
> "ou",

And, AFAIK, as a numeric symbol it has been replaced by initial lowecase
sigma.

--
Marco