Engineering
Computing and communicationTransportationEnergyAgricultureEngineeringRoboticsOptical, navigation and astronomicalIndustryInfrastructureMachinery and toolsWeaponsSpaceMilitary technologyComputing and information technology<span id="Tools and machinery"></span>Machinery and toolsGeneralNavigation and timekeepingMedia and communicationElectronicsFrom Lably lessonsTextilesMaterialsArtificial IntelligenceOptical technologyFood and healthTools and machineryComputer StudiesMedical technologyStructuresBiotechnologyOpticalComputer ApplicationsInformation TechnologyInformatics Practices
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- O-ringMechanical, toroid gasket that seals an interface
- Occupant-centric building controlsOccupant-centric building controls or Occupant-centric controls (OCC) is a control strateg
- Offshore drillingMechanical process where a wellbore is drilled below the seabed
- Old Bess (beam engine)1777 steam engine
- Operation CHASEUS Department of Defense program
- Operational excellencePhilosophy of business effectiveness
- Orbital decayProcess that leads to gradual decrease of the distance between two orbiting bodies
- Order of the EngineerProfessional association
- Oscillating cylinder steam engineSteam-engine design which does not require a valve gear
- Oscillating multi-toolAn oscillating multi-tool or oscillating saw is a multitool and power tool that oscillates
- Overall equipment effectivenessMeasure of how well a manufacturing operation is utilized
- Overhead valve engineType of piston engine valvetrain design