What is the meaning of Ist?

A practitioner or supporter of an ism.

third-person singular present indicative of zèinan

genitals

buttocks

upper part

top

sit

third-person singular present indicative of wesan

Romanization of ᛁᛊᛏ

third-person singular present of sein

Romanization of 𐌹𐍃𐍄

hush, shh

Source: wiktionary.org