Noun
The tenth letter of many Semitic alphabets/abjads (Phoenician, Aramaic, Hebrew, Syriac, Arabic and others).
A tool used to read a Torah.
Source: en.wiktionary.orgReymond illustrates that certain phonetic shifts (such as the shift of yodh > aleph and the opposite shift of aleph > yodh) occur in discernible linguistic contexts that suggest this was a real phonetic phenomenon. Source: Internet