| Acronym | Meaning |
 | K/T | Cretaceous/Tertiary Boundary |
| DAU | (U.S.) Defense Acquisition University |
| MJD | Modified Julian Day |
| RRSP | Registered Retirement Savings Plan (Canada; Roughly Equivalent To The IRA In The U.S.) |
| RPA | Regional Plan Association |
| ADOA | Air Defence Operations Area |
| BER | Bit Error Rate |
| IAQ | Indoor Air Quality - Infrequently Asked Questions |
| PIM | Parameterized Ionospheric Model - Path Of Intended Motion - Pediatric Index Of Mortality - Personal Information Manager/Management - Presence And Interworking Mobility - Processor-In-Memory - Program Integration Manager - Protocol Independent Multicast |
| NOAA | U.S. National Oceanic And Atmospheric Administration |
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