A.h. or ah
Placed beside a designated year, this abbreviation can stand either for Anno Hebraico, Latin for "in the Hebrew year," or it can stand for Anno Hegirae, Latin for "in the year of the Hegira." The Hegira refers to the flight of Mohammed from Mecca to Medina in CE 622, marking the beginning of the Moslem era. A reader generally knows which of these identical terms is being used because its context concerns either Jewish or Islamic history. Although, because these two cultures are so closely related, the reference must be made clear or it may cause confusion.Also see A.D., B.C., B.C.E., C.E., Islamic art, and Jewish art.