OOS
OOS is widely used in retail and e‑commerce to indicate an item is out of stock, and in technical fields it can describe an object‑oriented system, out‑of‑specification results, or synchronization issues.
Medical
Miscellaneous
OpenOffice org spreadsheet
Online Order System
Office of Operational Systems
Operation Ocean Shield
Overseas Occupational Standards
Oranges Or Strawberries
Out Of Story
Other Orbit Senshi
Out Of Sync
Ooc Operating System
Out Of Shield
Out of State/ Out Of Sorts/ Out Of Shillings
Oregon Offender Search
Out of State
Community
Governmental
Academic & Science
Computing
Out Of Service
Object-Oriented System
Ostrich Operating System
OTM (Optical Transport Module) Overhead Signal
Out Of Synchronization