Where does “آص” come from?

آص (Ottoman Turkish) comes from Proto-Turkic āŕ — few, a little; few, very little; few, little.

Ancestry of “آص”, step by step

Step	Language	Word	Meaning
1	Proto-Turkic	āŕ	few, a little; few, very little; few, little

آص — Etymology, Origin & Word History | Etymology Explorer