 If they were added by Cyril, it is likely that they were taken from an alphabet used for Christian scripture.It is frequently proposed that the letters "sha" , "tsi" , and "cherv" were taken from the letters "shin" ש and "tsadi" צ of the Hebrew alphabet, and that Ⰶ "zhivete" derives from Coptic "janja" Ϫ.However, Cubberley (1996) suggests that if a single prototype were presumed, the most likely source would be Armenian.