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    ESA > Our Activities > Human Spaceflight > Human Spaceflight Research

    Acronyms & abbreviations - O

    O2

    Oxygen

    O/B

    On Board

    O/O

    On/Off

    O/S

    Operating System

    OA

    Office Automation

    OACCB

    Office Automation Change Control Board

    OAD

    Orbit Analysis Division
    Orbit Attitude Division

    OAR

    Operational Anomaly Report

    OB

    Optical Bench

    OB-MNT

    On-Board Monitoring

    OBA

    Optical Bench Assembly

    OBC

    On-Board Computer

    OBDH

    On-Board Data Handling

    OBPR

    Office for Biological and Physical Research (part of NASA)

    OBS

    On-Board Software

    OBT

    On-board Training

    OC

    On-Call

    OCC

    Operations Control Centre

    OCF

    Out-of-limit Characteristics File

    OCM

    Orbit Control Mode

    OCOE

    Overall Check-Out Equipment

    ODB

    Operations DataBase

    ODBC

    Object-Oriented Database Connectivity
    Open Data Base Connectivity (Microsoft)

    ODD

    On-line Data Delivery

    ODF

    Observation Data File

    ODM

    Optical Diagnostic Module

    ODS

    Operational Data Store

    ODT

    Orbit Delay Time

    OD&TS

    Orbit Determination & Time Synchronisation

    OFD

    Office Function Desktop

    OFT

    Optical Fibre Thermometer

    OM

    Operations Manual

    OOS

    Open Source Software

    OPD 

    Operations Processes Document

    OPR

    Operations Phase Review

    ORU

    On-orbit Replaceable Unit

    OS

    Operating System

    OSAT

    On-Site Acceptance Tests

    OSR

    Optical Solar Reflectors

    OSTP

    Office of Science and Technology Policy

    Last update: 13 November 2008

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