AIHS meaning in Regional ?

Answer: What is American Irish Historical Society mean?

The American Irish Historical Society (AIHS) is a historical society devoted to Irish American history, founded in Boston in the late 19th century. Non-partisan and non-sectarian since its inception in 1897, it maintains the most complete private collection of Irish and Irish-American literature and history in the United States and publishes a journal entitled The Recorder. It also holds various cultural events at the society headquarters at 991 Fifth Avenue in New York City.

reference

Full Form	Category
American Interventional Headache Society	Academic & Science
Anderson Island Historical Society	Academic & Science
Ace Institute of Health Sciences	Governmental
American Italian Heritage Society	International
Applied Informatics for Health Society	Medical
American Indian Health and Services	Medical
Alberta Innovates Health Solutions	Medical
Acharya Institute of Health Sciences	Medical
American Irish Historical Society	Regional
Australian International Hotel School	Regional