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- OS
- OS&H
- OS(OSD)
- OS-1962
- OS-360
- OS-9
- OS-9000
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- OS-M1
- OS-Tan
- OS-Tans
- OS-X
- OS-chan
- OS-independent shellcode
- OS-level virtualisation
- OS-level virtualization
- OS-tan
- OS-tans
- OS/2
- OS/2 1.0
- OS/2 1.1
- OS/2 1.2
- OS/2 1.21
- OS/2 1.3
- OS/2 2.0
- OS/2 2.1
- OS/2 API
- OS/2 EA
- OS/2 Essentials
- OS/2 HPFS
- OS/2 HPFS386
- OS/2 HPFS 386
- OS/2 High Performance File System
- OS/2 LAN Manager
- OS/2 MVDM
- OS/2 NT
- OS/2 PM
- OS/2 Presentation Manager
- OS/2 Special Edition for Windows
- OS/2 Super-FAT
- OS/2 SuperFAT
- OS/2 Super FAT
- OS/2 Warp
- OS/2 Warp 3
- OS/2 Warp 3.0
- OS/2 Warp 3J
- OS/2 Warp 4
- OS/2 Warp 4.5
- OS/2 Warp Connect
- OS/2 Warp Connect (PowerPC Edition)
- OS/2 Warp Server
- OS/2 bitmap
- OS/2 code page 1004
- OS/2 codepage 1004
- OS/2 environment variable
- OS/2 extended attributes
- OS/2 for Windows
- OS/2 subsystem
- OS/32
- OS/360
- OS/360 HASP
- OS/360 MVT
- OS/360 Object File Format
- OS/360 and successors
- OS/390
- OS/4
- OS/400
- OS/45
- OS/6
- OS/7
- OS/8
- OS/90
- OS/9000
- OS/FS
- OS/M
- OS/MFT
- OS/MVS
- OS/MVT
- OS/Net
- OS/VS
- OS/VS1
- OS/VS1 BPE
- OS/VS2
- OS/VS2 (MVS)
- OS/VS2 (SVS)
- OS/VS2 (disambiguation)
- OS/X
- OS1
- OS10
- OS2
- OS2000
- OS2BIO.COM
- OS2DOS.COM
- OS2N Kingfisher
- OS2U
- OS2U Kingfisher
- OS35
- OS35 (Bulk Carrier)
- OS35 (bulk carrier)
- OS360
- OS4
- OS4000
- OS73
- OS8
- OS8 (disambiguation)
- OS9
- OS9 (disambiguation)
- OS9 (gene)
- OSA
- OSA-A
- OSA-II
- OSA-M
- OSA-UCS
- OSAA
- OSAAT
- OSAC
- OSADL
- OSAF
- OSAF (disambiguation)
- OSAHS
- OSAID
- OSAKI OSOL
- OSAL
- OSAM
- OSAM-1
- OSAM-2
- OSAMI
- OSAMI-D
- OSAMI-E
- OSAMI-F
- OSAM (disambiguation)
- OSAM ABDUL RAHAN AHMAD
- OSAP
- OSAPAC
- OSAPR
- OSAP (disambiguation)
- OSAS
- OSASCOMP
- OSAS (Once Saved, Always Saved)
- OSAS (disambiguation)
- OSAT
- OSAT (disambiguation)
- OSAV
- OSAX
- OSA (disambiguation)
- OSA Centre
- OSA Continuum
- OSA FC
- OSA Fellow
- OSA Group
- OSA Seattle FC
- OSA Uniform Color Scales
- OSA group
- OSA uniform color scales
- OSArc
- OSB
- OSB-Törekent (Ankara Metro)
- OSBA
- OSBI
- OSBL
- OSBM
- OSBOA
- OSBP
- OSBP2
- OSBP2 (gene)
- OSBPL11
- OSBPL11 (gene)
- OSBPL1A
- OSBPL1A (gene)
- OSBPL2
- OSBPL2 (gene)
- OSBPL3
- OSBPL3 (gene)
- OSBPL5
- OSBPL5 (gene)
- OSBPL8
- OSBPL8 (gene)
- OSBPL9
- OSBPL9 (gene)
- OSBP (gene)
- OSBP (software factory)
- OSBS
- OSB (building material)
- OSB (disambiguation)
- OSB Alliance
- OSB Group
- OSB board
- OSB synthase
- OSBiH
- OSB—Törekent (Ankara Metro)
- OSC
- OSC-15
- OSCA
- OSCAAR
- OSCAR
- OSCAR-10
- OSCAR-7
- OSCARS(r)
- OSCARS®
- OSCAR (disambiguation)
- OSCAR (gene)
- OSCAR (satellite)
- OSCAR 1
- OSCAR 10
- OSCAR 11
- OSCAR 18
- OSCAR 2
- OSCAR 27
- OSCAR 3
- OSCAR 33
- OSCAR 34
- OSCAR 37
- OSCAR 38
- OSCAR 4
- OSCAR 40
- OSCAR 43
- OSCAR 44
- OSCAR 45
- OSCAR 5
- OSCAR 50
- OSCAR 54
- OSCAR 62
- OSCAR 76
- OSCAR 8
- OSCAR 83
- OSCAR 84
- OSCAR H set
- OSCAR I-class
- OSCAR III
- OSCAR IV
- OSCAR McMaster
- OSCAR Protocol
- OSCAR Radio
- OSCAR Railway Costing
- OSCAR protocol
- OSCAR railway costing
- OSCAR train
- OSCA (association)
- OSCA (disambiguation)
- OSCA (song)
- OSCA MT4
- OSCC
- OSCC (disambiguation)
- OSCE
- OSCE-PA
- OSCE/Office for Democratic Institutions and Human Rights
- OSCEPA
- OSCE Minsk Group
- OSCE Minsk group
- OSCE Mission in Kosovo
- OSCE Mission to Croatia
- OSCE Needs Assessment Team in Armenia
- OSCE Office for Democratic Institutions and Human Rights
- OSCE PA
- OSCE Parliamentary Assembly
- OSCE RFoM
- OSCE Representative on Freedom of the Media
- OSCE Special Monitoring Mission in Ukraine
- OSCE Special Monitoring Mission to Ukraine
- OSCE Troika
- OSCE assessment mission to Armenia
- OSCE countries statistics
- OSCE in Europe
- OSCE statistics
- OSCE troika
- OSCHR
- OSCI
- OSCL
- OSCOLA
- OSCON
- OSCON (disambiguation)
- OSCP
- OSCPE
- OSCR
- OSCT
- OSCVI
- OSC (ANSI)
- OSC (control code)
- OSC (disambiguation)
- OSC Bremerhaven
- OSC Budapest
- OSC Cygnus
- OSC DIS
- OSC Lille
- OSC OSCar
- OSC Oscar
- OSC Pegasus
- OSC Stargazer
- OSC Vellmar
- OSCav
- OSCommerce
- OSCyL
- OSD
- OSDA
- OSDC
- OSDD
- OSDE
- OSDEM
- OSDEM 2000
- OSDFS
- OSDI
- OSDI (disambiguation)
- OSDL
- OSDL Patent Commons Project
- OSDL Patent Commons project
- OSDMT
- OSDN
- OSDV
- OSDZ
- OSD (Officer on Special Duty)
- OSD (disambiguation)
- OSD Beograd
- OSD Policy
- OSDev
- OSDyson
- OSE
- OSEAX
- OSEC
- OSEG
- OSEK
- OSEK/VDX
- OSEKtime
- OSEO
- OSER1
- OSERS
- OSES
- OSESP
- OSET
- OSEU
- OSE (disambiguation)
- OSE Class 120
- OSE Class 220
- OSE Class H560
- OSE Karaagac Cut Off
- OSE Karaağaç Cut Off
- OSE class 120
- OSE class 460
- OSE class 520
- OSE class A.101
- OSE class A.151
- OSE class A.201
- OSE class A.451
- OSE class A.501
- OSE class A.551