What is "jhvh"

IHVH \IHVH\ [Written also JHVH, YHVH.] 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.

Note: Numerous attempts have been made to represent the supposed original form of the word, as Jahaveh, Jahvaj, Jahve, Jahveh, Yahve, Yahveh, Yahwe, Yahweh, etc.