| AOM | Acousto-optic modulator |
| APD | Avalanche photo-diode |
| CW | Clockwise |
| CCW | Counter-clockwise |
| DOF | Degree of freedom |
| EOM | Electro-optic modulator |
| EOP | Earth orientation parameter |
| EW | East-West |
| FSR | Free-spectral-range |
| IERS | International Earth Rotation and Reference Systems Service |
| LoD | Length of day |
| MZ | Mach–Zehnder |
| NS | North-South |
| PD | Photo-diode |
| PDH | Pound–Drever–Hall |
| PZT | Piezo transducer |
| PID | Proportional-integral-derivative |
| PRG | Passive resonant laser gyroscope |
| RLG | Ring laser gyroscope |
| RAM | Residual amplitude modulation |
| UT1 | Universal Time 1 |
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