| Abbreviation | Definition |
|---|---|
| NW | N - Well |
| NWE | Next Wave Electronics |
| NXC | NetLinx Control Card |
| NYA | VDE wire code: N means copper conductor, Y means PVC insulator , A means installing wires inside pipes. ( By: UCF) |
| NZL | Non-Zero Level |
| NZT | Non-Zero Timing |
| O | form O solenoid (actuator Only, no contacts) |
| O | Off |
| O | Operating |
| O | Output |
| OA | Organic Acid |
| OAC | Optical Absorption Coefficient |
| OADM | Optical Add-Drop Multiplexer |
| OAME | Orbital Attitude and Maneuvering Electronics |
| OB | Optical Bar |
| OBA | Object Behavior Analysis |
| OBAM | One Big Audio Matrix |
| OBDC | On Board Doppler Compensation |
| OBEM | Object-Based Equipment Model |
| OBF | Optical Beat Frequency |