| Category | Contains the number of abbreviations |
|---|---|
| Academic Degrees | 1631 |
| Alumni | 395 |
| Amateur Radio | 841 |
| Anthropology | 40 |
| Archaeology | 160 |
| Architecture | 1622 |
| Astronomy | 966 |
| Atmosphere | 108 |
| Biology | 1086 |
| Biotechnology | 181 |
| Botany | 737 |
| British Degree | 187 |
| Campus | 281 |
| Chemistry | 3552 |
| Climate | 324 |
| Colleges | 3945 |
| Ecology | 176 |
| Economics | 120 |
| Electronics | 7711 |
| Engineering | 1722 |
| Genealogy | 401 |
| Geography | 156 |
| Geology | 1063 |
| Hydrology | 85 |
| IEEE | 920 |
| Language & Literature | 2075 |
| Libraries | 3010 |
| Linguistics | 117 |
| Literacy | 312 |
| Mathematics | 3111 |
| Mechanics | 328 |
| Meteorology | 1753 |
| Nuclear | 221 |
| Ocean Science | 3314 |
| Optics | 104 |
| Physics | 2970 |
| Psychology | 866 |
| Research | 5334 |
| Robotics | 178 |
| Societies | 11516 |
| Sociology | 103 |
| Statistics | 271 |
| Students | 2959 |
| Universities | 14390 |
| Zoology | 77 |