Ϛ

Ϛ The stigma or vau (cp. Semitic waw [ו]), sixth letter of the oldest Gk. alphabets. It is used to express the numeral 6 in the form Ϛ´ (one of the earlier forms is ϝ; s. Schwyzer III 110 index; L-S-J-M s.v. F): six or sixth in the titles of Hm 6 and Hs 6. Cp. the entry χξϚ´ Rv 13:18 v.l.