IHVH
IHVH. [Written also JHVH, YHVH.]
Definition: A transliteration of the four constants forming the Hebrew
tetragrammaton or "incommunicable name" of the Supreme Being, which
in latter Jewish tradition is not pronounced save with the vowels of
adonai or elohim, so that the true pronunciation is lost.
Numerous attempts have been made to represent the supposed original
form of the word, as Jahaveh, Jahvaj, Jahve, Jahveh, Yahve, Yahveh,
Yahwe, Yahweh, etc.
Source: Webster’s Unabridged Dictionary 1913 Edition