In the Rite of Perfection as worked in France and America this Cabalistic influence is shown in those degrees known under the name of the "Ineffable Degrees," derived from the Jewish belief in the mystery that surrounds the Ineflable Name of God. According to the custom of the Jews, the sacred name Jehovah or Jah-ve, composed of the four letters yod, he, vau, he, which formed the Tetragrammaton, was never to be pronounced by the profane, who were obliged to substitute for it the word "Adonai."
Source: wiktionary
It is really a corruption of, or perhaps rather a substitution for, the Hebrew letter (yod), which is the initial of the ineffable name.
Source: wiktionary
A statement of consonantal changes for Sicilian is dependent on the development of two sets of clusters, consonant plus yod and consonant plus /l/.
Source: wiktionary
Wherever in the West (including northern Italia) the fricative allophone [x̺] of coda /k/ before onsets /t/ and /s/ still remains…it now becomes semivocalized as yod, or more probably voiceless yod….
Source: wiktionary
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