| Abbreviation | Definition |
|---|---|
| OVL | Overlay |
| OVM | Optical Velocity Meter |
| OVM | Output Variance Minimization |
| OVP | Optical Video Probe |
| OVP | Over Voltage Protection |
| OVQ | Optimum Video Quality |
| OWL | One Way Low |
| OX | Oxide |
| OXC | Optical Cross-Connect |
| OXD | OXadiazole Dielectric |
| OXL | Optical Cross-Link |
| OXN | Optical Cross- Network |
| P | Pico- |
| P | Plate |
| P | Port |
| P | Positive connection |
| P | Potential |
| P | Probe |
| P=EI | Power 'W' in wattage is equal to 'E' amperes(Ohm's Law) |
| PA | Parent Relay |