IAAN meaning in Sports ?

Answer: What is Intercollegiate Athletic Association of the Northwest mean?

The Intercollegiate Athletic Association of the Northwest was a college athletic conference from 1892 to 1893 in the Upper Midwest of the United States. Four universities were members: the University of Michigan, the University of Minnesota, Northwestern University and the University of Wisconsin–Madison. The conference was formed to compete in football, baseball and track. It only survived for two seasons before disbanding due to financial problems throughout the league. The four schools came together again, along with Purdue University, the University of Chicago and the University of Illinois, to found the Intercollegiate Conference of Faculty Representatives a couple of years later, known today as the Big Ten Conference.

reference

Full Form	Category
Indiana Academic Advising Network	Academic & Science
Idiopathic Adolescent Acute Neurodegeneration	General
International Association of Airline Nurses	International
Intercollegiate Athletic Association of the Northwest	Sports