Alright, here's what I have made of the situation... Digamma is closely related to the Hebrew "vau", meaning six. Eventually, this was supplanted by "stigma", a letter originally combined of Sigma-Tau (*T) which looks either almost exactly like the final Sigma when rendered in post hellenic lowercase Greek although stigma itself is ONLY a numeral - not at all given any pronounced letter status. The capital Sigma as rendered in ancient Greek texts is often "[" or a more curvy form, looking like "C". Now, the real problem comes in when Stigma ALSO sometimes gets represented as that "C"-like character, relying on context to tell it apart. Here's how I see it, though: Given the numbers 10, 6, and 200, we ought to figure out something sooner or later. ;)

I still think, since Stigma as the "C" character is not nearly as common, let alone standard, we are looking at a 10 within a 200.

> And again, do not forget, a normal sigma is
> "diakosioi" - 200.

> Maybe it's 200/10 (I in C) and therefore 20. T is the 20th letter of the
> alphabet. And 20th element on the periodic table = Ca.