yadiashTa - the fourth (and last) line of letters in the katapayaadi formula, with 8 letters, ya ra la va sha shha sa ha

yati - a rhythmic pattern of swaras, words, or beats in a taaLa. The types are: sama, gOpucca, srotovaaha, Damaru, mridanga, and vishama

yEru niral - a Tamil term for aarOha

yi - abbreviation for ili