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Glossary of IT Terms beginning with "O"

Brian Cryer's Glossary of IT Terms with Links. Definitions and links to further information on IT related terms ...

OAL
Offline Address List(s), details ...
OBDR
One Button Disaster Recovery, details ...
OBS
Organizational Breakdown Structure / Observation, details ...
OC
Over Clocked, details ...
OCI
Oracle Call Interface, details ...
OCR
Optical Character Recognition, details ...
ODBC
Open Database Connectivity, details ...
ODF
Open Document Format, details ...
ODP
Open Directory Project, details ...
OE
Outlook Express / Operator Error / Office Equipment, details ...
OEM
Original Equipment Manufacturer / Licensed for use with OEM equipment, details ...
OEP
Original Entry Point, details ...
OGC
Open GIS Consortium, details ...
OGCE
Open GIS Consortium (Europe), details ...
OL
Outlook / Ordered list (tag) / Operating Losses, details ...
OLAP
On-Line Analytical Processing, details ...
OLCP
On-Line Complex Processing, details ...
OLE
Object Linking and Embedding, details ...
OLED
Organic Light Emitting Diode, details ...
OLS
Open Location Services, details ...
OLTP
On-Line Transaction Processing, details ...
OMA
Open Mobile Alliance, details ...
OMA DRM
Open Mobile Alliance Digital Rights Management, details ...
OMD
Object Model Diagram, details ...
OMG
Object Management Group / slang, details ...
OMR
Optical Mark Reader / Optical Mark Recognition, details ...
OO
Object oriented / Object orientation, details ...
OOA
Object Oriented Analysis, details ...
OOBE
Out Of Box Experience, details ...
OOD
Object Oriented Design, details ...
OOO
Out Of Office / OpenOffice.org, details ...
OOP
Object oriented programming / Out of process / Out of print, details ...
OOS
Occupational Overuse Syndrome / Out of service, details ...
OOSD
Object Oriented Structured Design, details ...
OP
Operator / Out of print / Observation point / Opera / Original post, details ...
OPB
Oracle PowerBrowser, details ...
OPC
Open Packaging Convention, details ...
OPEN
Object Oriented Process, Environment and Notation / Openly available / To access, details ...
OpenLS
OpenGIS Location Service, details ...
Open Relay
A mail server that will route e-mail from any originator without authentication, details ...
Open Source
Program code made available to others, details ...
Open VMS
Correct name for VMS (OS), details ...
Operating System Authentication
The process of an operating system authenticating a user / Application requesting user authentication from the operating system, details ...
Operational Risk
The risk of loss due to failings of systems, details ...
OPCS
Office for Population Censuses and Surveys, details ...
OPM
Object Process Methodology / Office of Personnel Management, details ...
OPS
Oracle Parallel Server / Operations (department), details ...
opt-in e-mail
Marketing e-mail to those who have agreed to receive it, details ...
ORDBMS
Object Relational DBMS, details ...
ORM
Object Relational Mapping / Object Role Modeling, details ...
Orthophoto
A copy of an image corrected for variations in scale and height displacements details ...
OS
Operating system / Open Source / Ordnance Survey, details ...
OSD
Open Source Definition / On Screen Display, details ...
OSI
Open Systems Interconnection / Open Source Initiative, details ...
OSI Model
OSI 7 Layer reference model, details ...
OSI 7 Layer Reference Model
Reference model for communications, details ... 
OSL
Open Subscription License, details ...
OSS
Open source software, details ...
OT
Off topic / Old Testament, details ...
OTA
Over The Air, details ...
OTC
Order to cash / Online Technical Communities, details ...
OTE
On Target Earnings, details ...
OTN
Oracle Technology Network, details ...
OTOH
On the other hand, details ...
OTP
One Time Password / One Time Programmable, details ...
OTR
Other / Outer / On the read, details ...
OTT
Over the top / Online teaching tools, details ...
OU
Organisational Unit, details ...
out-of-process server
COM object implemented as a separate executable or DLL, details ...
OWA
Outlook Web Access, details ...