What does HOI stand for?

Handbook of Operating Instructions - Navy

Handbook of Overhaul Instructions - Navy (MCD)

Hao Island - French Polynesia - Airport symbol (OAG)

Headquarters Office Instruction

Headquarters Operating Instructions - Air Force (AFM)

Health Optimizing Institute (EA)

Health Outcomes Institute (ADWA)

Hear O Israel (EA)

Higher Order Interface

Holikachuk - Language code (ETLW)

Hospital Onset of Infection - Medicine (DMAA)

House of Issue - Banking

Hypoiodous Acid (STED)

Hytran Operations Interpreter (SAUO)

Superior Hovercraft - NCIC boat manufacturer code (NCIC)

Superior Hovercraft, Imperial Beach, CA - Manufacturer code for watercraft hull identification number (USCG)