What is the meaning of Yat?

A vowel letter of the Cyrillic and Glagolitic alphabet (Cyrillic capital Ѣ, Cyrillic small ѣ, Glagolitic ), no longer in current use

The Late Proto-Slavic (Common Slavic) vowel that was represented by this letter, usually transcribed as /ě/. This vowel underwent various alterations in the later Slavic dialects and is no longer distinguished (except in Ijekavian).

Alternative spelling of yatt (woman)

remembrance, memory

yacht

foreigner

second-person singular imperative of yatmak

squirrel

stick, cane

Source: wiktionary.org