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OIS
Image stabilization
Object Oriented Input System
Objective Interface Systems
Ocular ischemic syndrome
Oeiras International School
Ops in Surgery, The St George's Surgical Society
Optical IP Switching
Organised Independents
Original Inner Sleeve
Oulu International School
Overnight indexed swap
Oxford International School (Panama)
Oxford International School, Dhaka
Oxygen isotope stage
Senescence
Wang Laboratories
Örgryte IS