Abbreviations & Acronyms Dictionary

Object Identification System
Object information system
Objective Instrumentation System
Objective Interface Systems
Obstacle Identification Surface
Obstruction Identification Surfaces
Ocular ischemic syndrome
Office Information System
Office Information Systems
Office of Information Security
Office of Information Services
Office of Information Systems
Office of Instructional Services
Office of International Services
Office of Investigatory Services
Officer Indoctrination School
OGE INPUT SIMULATOR
Oh I see
Oil States International, Inc.
Ontario Investment Service
Open Interface Specification
Operating information system
Operational Increments
Operational Information Service
Operational Information System
Operational Intercom System
Operational Intercommunication System
Operational Intercommunications System
Operations Information System
Operator Interface Station
Opportunistic illnesses
Opportunistic infections
Optical Imager Study
Optical imaging spectroscopy
Optical Imaging System
Optical Imaging Systems
Optical Imaging Systems, Inc.
Optical Information System
Optical Interface System
Optical intrinsic signal
Optics and Instrumentation Software
Oracle Integration Server
Orbit Improvement System
Orbit Injection Subsystem
Orbit Inserting System
Orbit Insertion Stage
Orbit Insertion Subsystem
Orbital Insertion Subsystem
Orbital Instrumentation Systems
Orbiter Insertion Stage
Orbiter Instrumentation Systems
Ordnance Information System
Ordnance initiation set
Organ injury scale
Organ Injury Scaling
Organization for Internet Safety
Organization for Internet Security
Originating International Switch
Oslo Ischemia Study
Osteopathic Information Service
Outpatient information system
Overnight Index Swaps
Oxygen intermediates
Oxygenation indices