Jah

""Yah", an abbreviated form of the Tetragrammaton, occurs 23 times: 18 times in the Psalms, twice in Exodus, and three times in Isaiah. This form is identical with the final syllable in the word "Hallelujah", which occurs 24 times in the last book of the Psalms (comp. also "be-Yah", Isa. xxvi. 4 and Ps. lxviii. 5). It is transcribed by the Greek "Ia", as "Ehyeh" is represented by "Aia", thus showing that "Yah" was the first syllable of ."

"The Yod () must be attached to the Heh () to make YH (). This is the Inner Chamber [since these are the first two letters of the Tetragrammaton, YHVH ()]. This is the place that conceals the highest point, which is the Yod ()."