| Abbreviation | Definition |
|---|---|
| NBRA | Neutral Blended Ratio Attenuator |
| NPIC | National Photographic Interpretation Center |
| OCF | Off Camera Flash |
| OCF | Off-Camera Flash |
| OE | Over Exposed |
| OHP | Open Homes Photography |
| OM | Olympus Maitani |
| ORF | Olympus Raw Format |
| ORTHO | Orthochromantic Film |
| OTWB | One Touch White Balance |
| P | Photo |
| P | Programmed autoexposure |
| p.c. | post card |
| PAL | Panoramic Annular Lens |
| PAN | PANchromantic film |
| PASM | Program AE, Aperture priority, Shutter priority, Manual |
| PBN | Photography Book Now |
| PC | Paper Chromatography |
| PCLI | Photography Club of Long Island |
| PCLK | Pixel Clock |