| Acronym | Meaning |
| ACOP | Approved Code Of Practice (UK) |
| APLG | Antisymmetrized Product Of Localized Geminals (wave Function) |
| GGA | Generalized Gradient Approxn. |
| TIWSLS | Time-independent Wave Packet Schroedinger (and) Lippmann-Schwinger (equation) |
| ASSIST | Abstract Semi-Markov Specification Interface To The SURE Tool [propulsion] |
| IUAPPA | International Union Of Air Pollution Prevention Associations |
| ESE | Extended-surface Electrolysis |
| MTB | Mycobacterium Tuberculosis |
| OMEX | Ocean Margin Exchange |
| NCCLS | National Committee For Clinical Laboratory Standards |