Mimation

Mimation (تَمْيِيم, tamyīm), is the phenomenon of a suffixed -m  (the letter mem in many Semitic abjads) which occurs in some Semitic languages.

This occurs in Akkadian on singular nouns. It was also present in the Proto-Semitic language.

It is retained in the plural and dual forms in Hebrew. It corresponds to the letter nun (-n) in Classical Arabic and is retained in the singular (nunation), dual, and plural.