| Acronym | Meaning |
![](file.png) | OGO | Orbiting Geosurvey Observatories |
![](file.png) | OMB | Office Of Management And Budget |
![](file.png) | OMDP | Orbiter Maintenance Down Period |
![](file.png) | OMS | Orbital Maneuvering System |
![](file.png) | OPF | Orbiter Processing Facility |
![](file.png) | ORBI | Stock Ticker Symbol For OSC |
![](file.png) | ORFEUS | Orbiting And Retrievable Far And Extreme Ultraviolet Spectrometer |
![](file.png) | OSC | Orbital Sciences Corporation |
![](file.png) | OSCAR | Orbiting Satellite Carrying Amateur Radio |
![](file.png) | OSS | Office Of The Space Station |
![](file.png) | OSSA | Office Of Space Science And Applications |
![](file.png) | OSSE | Oriented Scintillation Spectrometer Experiment |
![](file.png) | OSTP | Office Of Science And Technology Policy |
![](file.png) | OTA | Optical Telescope Assembly |
![](file.png) | OTFE | Oscillatory Thermocapillary Flow Experiment |
![](file.png) | OTHB | Over The Horizon Backscatter |
![](file.png) | OTV | Orbital Transfer Vehicle |
![](file.png) | OV | Orbital Vehicle |
![](file.png) | PAM | Payload Assist Module |
![](file.png) | PAM-D | Payload Assist Module |
![](file.png) | PARE | Physiological And Anatomical Rodent Experiment |
![](file.png) | PASS | Primary Avionics Software System |
![](file.png) | PC | ParseC (usu. Pc) |
![](file.png) | PCG | Protein Crystal Growth Experiment |
![](file.png) | PCGG | PCG Glovebox |
![](file.png) | PCT | Photometric Calibration Test |
![](file.png) | PDE | Particle Dispersion Experiment |
![](file.png) | PDRS | Payload Deployment And Retrieval System |
![](file.png) | PDS | Planetary Data System |
![](file.png) | PEM | Payload Electronics Module |
![](file.png) | PEM | Particle Environment Monitor |
![](file.png) | PHA | Physics And Astronomy |
![](file.png) | PI | Principal Investigator |
![](file.png) | PLB | Payload Bay |
![](file.png) | PLBD | Payload Bay Doors |
![](file.png) | PLSS | Portable Life Support System |
![](file.png) | PM | Pressurized Module |
![](file.png) | PMC | Permanently Manned Capability |
![](file.png) | PMIRR | Pressure Modulated InfraRed Radiometer |
![](file.png) | PMS | Pre-Main Sequence |
![](file.png) | PMT | PhotoMultiplier Tube |
![](file.png) | PN | Planetary Nebula |
![](file.png) | POCC | Payload/Platform Operations Control Center |
![](file.png) | POEM | Polar Orbiting Earth Mission |
![](file.png) | POP | PO Polyot |
![](file.png) | PPF | Columbus Polar Platform |
![](file.png) | PPM | Positions And Proper Motions (catalog) |
![](file.png) | PRTLS | Powered RTLS |
![](file.png) | PSF | Point Spread Function |
![](file.png) | PSR | PulSaR |