| Radiation Protection Officer | Radiation Protection Officer Database | Radiation Protection Officer's Course | Radiation Protection Program | Radiation Protection Program Evaluation |
| Radiation Protection Standard | Radiation Protection Supervisor | Radiation Protection Technician | Radiation/Radiological Monitoring | Radiation Reliability and Assurance Experiment |
| Radiation Research Associates, Inc | Radiation Research Society | Radiation Safety and Control Services | Orbit Average Power | Orbit Bexley Housing Association |
| Orbit Circularization System | Orbit Control Subsystem | Orbit Correction Maneuver | Orbit Data File | Orbit Data Systems Limited |
| Orbit determination | Orbit Determination | Orbit Determination and Time Synchronization | Orbit Determination Beacon | Orbit Determination Facility |
| Orbit Determination System | Orbit Determination Tool Kit | Orbit E-Commerce Inc. | Orbiter Ancillary | Orbiter Attachment System |
| Orbiter Avionics Software Control Board | Orbiter Avionics to Station Interface System | Orbiter-based Station Avionics | Orbiter Communication Adapter | Orbiter Docking System |
| Orbiter Electric Field Detector | Orbiter Experiments | Orbiter/External Tank | Orbiter Maintenance & Checkout Facility | Orbiter Maintenance Down Period |
| Orbiter Maintenance Instruction | Orbiter Maintenance Workstation | Orbiter Major Modification | Orbiter Midbody Umbilical Unit | Orbiter Multiplayer Project |
| Orbiter Neutral Mass Spectrometer | Orbiter Payload | Orbiter Payload Work Station | Orbiter Processing Facility | Orbiter Project Office |
| Orbiter Refueling System | Orbiter Replacement Unit | Orbiter Return to Flight Working Group | Orbiter Rocket Racing League | Orbiter Space Vision System |
| Orbiter Test Conductor | Orbiter Timing Buffer | Orbiter Vehicle | Orbiter Weather Protection | Orbit-Following Monte-Carlo |
| Orbit Improvement System | Orbit Infotech | Orbiting and Retrievable Far and Extreme Ultraviolet Spectrograph Shuttle Pallet Satellite | Orbiting and Retrievable Far and Extreme Ultraviolet Spectrometer | Orbiting Astronomical Observatory |
| Orbiting Carbon Observatory | Orbiting Deep Space Relay Station | Orbiting Geophysical Observatory | Orbiting Mirror | Orbiting Planetary Observatory |
| Orbiting Radio Bearer Ionospheric Satellite | Orbiting Satellite Carrying Amateur Radio | Orbiting Solar Laboratory | Orbiting Solar Observatory | Orbiting Solar Observatory - 8 |
| Orbiting Space Laboratory | Orbiting Vehicle | Orbiting Very Large Baseline Interferometer | Orbiting Wide-Angle Light Collector | Orbiting Workshop |
| Orbiting X-Ray Observatory | Orbit Insertion Maneuver | Orbit Library Manager | Orbit Micro | Orbit Motion Limited |
| Orbito-Meatal Baseline | Orbit Plane Experiment Package | Orbit Prediction | Orbit Showtime Network | Orbits Per Minute |
| Orbit to Orbit Shuttle | Orbit-to-Orbit Stage | Orbitto-Orbit Stage | Orbit Transfer System | Orbitz for Business |
| Orbix Database Adapter Framework | ORBK | ORBL | ORBO | ORBP |
| ORBS | ORBV | ORBWQI | ORBZ | ORC |
| ORC1 | ORCA | ORCAA | ORCAM | ORCAN |
| Orca Relief Citizens' Alliance | ORCAS | Orcas Island | Orcas Island Chamber Music Festival | Orcas Island Community Foundation |
| Orcas Island High School | Orcas Island School District | Orcas Island Yacht Club | ORC Association Nippon | ORCATS |
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