See also: אַ, 
א, 
ℵ, and Appendix:Variations of "a"
 
 
Hebrew
Letter
אָ • (a/ o) (kamatz variation of א)
-  (Hebrew with niqqud) A variation of the consonant א (“aleph”), using kamatz to indicate a specific ancient vowel, approximately /ɑ/.
 
 
Yiddish
Interjection
אָ! • (o!)
-  oh!