Glossary of Terms
| ADC | Atmospheric Dispersion Corrector |
| ANSI | American National Standards Institute |
| AO | Adaptive Optics |
| ASME | American Society of Mechanical Engineers International |
| ATA | Air Transport Association |
| CARA | California Association for Research in Astronomy |
| CENELEC | European Committee for Electrotechnical Standardization |
| CFR | Code of Federal Regulations |
| dBA | Sound level in decibels, measured using the A contour frequency weighting network |
| DCS | Drive and Control System |
| EIA | Electronic Industries Alliance |
| EMI | Electro Magnetic Interference |
| FOV | Field Of View |
| FWHM | Full Width at Half Maximum. The width across an optical beam profile where its intensity drops to half of its peak, or maximum, value. Unless otherwise indicated the beam is assumed to be symmetric about the optical axis |
| IBC | International Building Code |
| ICC | International Code Council |
| IEEE | Institute of Electrical and Electronics Engineers |
| KSD | Keck Software Document |
| LRIS | Low Resolution Imaging Spectrograph |
| MTBF | Mean Time Between Failures |
| NEBS | Network Equipment Building System |
| NEMA | National Electric Manufacturers Association |
| OSHA | Occupational Safety and Health Administration |
| SSC | Science Steering Committee |
| RT4 | Rail Transport position 4, (Nasmyth deck, Keck I) |
| TBD | To Be Determined |
| UL | Underwriters Laboratories Inc. |
| USGS | United States Geological Survey |
| WMKO | W.M. Keck Observatory |