AIN
AIN can describe a file‑archive format, a military communications network, a corporate name, an advanced intelligent network architecture, or an academic admission index number.
Medical
Acute Infectious Nephritis
Acute Interstitial Nephritis
American Institute of Nutrition
Anterior Interosseous Nerve
anterior interpositus nucleus–anatomy
Assistant In Nursing
Anal Intraepithelial Neoplasia
autoimmune neutropenia
Miscellaneous
American Independent Network
Aviation International News
Andean Information Network
Applied Improvisation Network
AUGMENTED INDEX denote
AIDS Interfaith Network