OI
OI is used in electronics to denote an opto‑isolator, a component that transfers signals while keeping circuits electrically separate, and in software engineering it can mean object interface, describing a contract between software modules; the letters also appear in medical and statistical contexts.
Medical
Miscellaneous
Object Integration
Office International
Other Identification
Ordinal Indicator
Origin Independent
Orthostatic Intolerance
October Introduction
Optical Isolator
Online Injection
Out Of Iraque
Operations Information
Owens Illinois
Open Integration
Operations Innovations
Online Inclusion
Original Images
Community
Orthopedic Impairment
Office of Investigation
Outreach International
Opportunistic Infections
Output Input
Governmental
Obsessive Influence
Operation Insanity
Outram Institute
Outside Influence
Out Of Iraq
Operational Instrumentation
Operations Interface
Orbiter Insertion
Orbiter Instrumentation
Office of Intelligence (USCS)
Operating Instruction
Oriental Institute