Audio Interface Unit
Avionics Interface Unit
Abort Interface Unit
Advanced Interface Unit
Alarm Interface Unit
Absolute iodine uptake
Access Interface Unit
Accident Investigation Unit
Acknowledge Interchange Unit
Activate Indication Upstream
Advanced Instrumentation Unit
AFSPC IDHS Upgrade
AI Upstream
Airborne Instrumentation Unit
Alicante Internacional Airlines
Alliant International University
American Intercontinental University
American International University
Analog Interface Unit
Antenna Interface Unit
antigen-inducing unit
Application Interface Unit
armament interface unit
Army Interrogation Unit
Association Internationale des Universites
Atlantic International University
Automated Information Utility
Automatic Digital Network Interface Unit
IATA code for Atiu Island Airport, Atiu Island, Cook Islands
Ambulatory Infusion Unit
Asociación Internacional de Universidades
Association Internationale des Urbanistes