| Abbreviation | Meaning | Category |
| END | END | Action |
| MID | MIDdle | Action |
| STR | STaRt | Action |
| HUM | HUMidity | Environment |
| PRS | PReSsure | Environment |
| TMP | TeMPerature | Environment |
| WND | WiND | Environment |
| BIN | BINning | Image |
| PRD | Partly Read Out | Image |
| AO | Adaptive Optics | Instrument |
| APT | APerTure | Instrument |
| DET | DETector | Instrument |
| FLT | FiLTer | Instrument |
| PIX | PIXel | Instrument |
| PX | PiXel | Instrument |
| RET | RETarder | Instrument |
| SLT | SLiT | Instrument |
| ANG | ANGle | Statistics/Unit |
| AVE | AVErage | Statistics/Unit |
| CEN | CENter | Statistics/Unit |
| DIR | DIRection | Statistics/Unit |
| DISP | DISPersion | Statistics/Unit |
| FCT | FaCTor | Statistics/Unit |
| LEN | LENgth | Statistics/Unit |
| MAX | MAXimum | Statistics/Unit |
| MED | MEDian | Statistics/Unit |
| MIN | MINimum | Statistics/Unit |
| MOD | MODe | Statistics/Unit |
| PA | Position Angle | Statistics/Unit |
| RES | RESolution | Statistics/Unit |
| RNG | RaNGe | Statistics/Unit |
| SD | Standard Deviation | Statistics/Unit |
| SPC | SPaCial/SPaCe | Statistics/Unit |
| SPD | SPeeD | Statistics/Unit |
| SZ | SiZe | Statistics/Unit |
| TYP | TYPe | Statistics/Unit |
| VAL | VALue | Statistics/Unit |
| WAV | WAVelength | Statistics/Unit |
| WID | WIDth | Statistics/Unit |
| ADC | Atmospheric Dispersion Corrector | Telescope |
| AE | Absolute Encoder | Telescope |
| AG | AutoGuider | Telescope |
| AIRM | AIR Mass | Telescope |
| AZ | AZimuth | Telescope |
| CAL | CALibration source | Telescope |
| CS | CaSsegrain focus | Telescope |
| DEC | DEClination | Telescope |
| DOM | DOMe / enclosure | Telescope |
| EL | ELevation | Telescope |
| ELBX | Electric Terminal BoX | Telescope |
| FOC | telescope FOCus | Telescope |
| FV | Field Viewer | Telescope |
| IE | Incremental Encoder | Telescope |
| IMR | IMage Rotator | Telescope |
| INR | INstrumental Rotator | Telescope |
| M2 | Secondary Mirror | Telescope |
| M3 | Tertiary Mirror | Telescope |
| NS | NaSmith focus | Telescope |
| PF | Primary Focus | Telescope |
| PM | Primary Mirror | Telescope |
| PMA | Primary Mirror Actuator | Telescope |
| POS | POSition | Telescope |
| PRB | PRoBe | Telescope |
| RA | Right Ascension | Telescope |
| SECZ | SECant of Zenith distance | Telescope |
| TEL | TELescope | Telescope |
| TIP | Tip/Tilt | Telescope |
| ZD | Zenith Distance | Telescope |
| HST | Hawaii Standard Time | Time |
| JD | Julian Date | Time |