| Acronym | Meaning |
 | ON | Ontario (postal Symbol) |
| SDSS | Sloan Digital Sky Survey |
| PAPI | Precision Approach Path Indicator (aviation) |
| PTUI | Plain-Text User Interface (pa-too-ey) (cf CLI) |
| AG | Attogram |
| MT | Millitesla |
| AAWC | Anti-Air Warfare Commander |
| MLWS | Mean Low Water Springs (nautical Charts) |
| AFAIR | As Far As I Remember/Recall |
| AJ | Azerbaijan (FIPS 10-4 Country Code) |
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