| Acronym | Meaning |
| PY | Paraguay (ISO 3166 Digram) - Person-Year -Portsmouth Yardstick |
| SOHC | Single-OverHead-Cam Engine |
| MCR | My Chemical Romance |
| AA | Achieved Availability - Alcoholics Anonymous -Armed Forces Americas (postal Symbol) - Aruba (FIPS 10-4 Territory Code) -Assembly Area - Automobile Association- Avenue Of Approach |
| JDAM | Joint Direct Attack Munition (djay-dam) |
| NH | Nanohenry |
| SVD | Singular Value Decomposition - Snaiperskaya Vintovka Dragunova (??????????? ???????? ????????? |
| MOPP | Mission-Oriented Protective Posture |
| HAT | Highest Astronomical Tide (nautical Charts) -Hungarian Automated Telescope |
| MB | Manitoba (postal Symbol) - Martinique (FIPS 10-4 Territory Code) |