| Acronym | Meaning |
 | LEN | Large Extension Node |
| DWIM | Do What I Mean |
| AMO | Atlantic Multidecadal Oscillation |
| IFO | Identified Flying Object (see Also UFO) |
| IO | British Indian Ocean Territory (ISO 3166 Digram; FIPS 10-4 Territory Code) |
| UO | Urban Operations |
| PS | Pashto Language (ISO 639-1 Code) - Picosecond |
| HSPH | Harvard School Of Public Health |
| STAT | Signal Transducers And Activators Of Transcription (cell Biology) - Special Tertiary Admissions Test (Australia) |
| TPS | The Pennington School |
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