letter of Iēsous ( Ἰησοῦς ), Greek for " Jesus ". Chi (ch) is the first letter of Christos ( Χριστός ), Greek for "anointed". Theta (th) is the first letter of Theou ( Θεοῦ ), Greek for "God's", the genitive case of Θεóς , Theos , Greek for "God". Ypsilon