| Acronym | Meaning |
 | PCCIP | President's Commission On Critical Infrastructure Protection |
 | MRS | Magnetic Resonance Spectroscopy |
 | CHU | Old Church Slavonic Language (ISO 639-2 Code) |
 | AIRS | Aerometric Information Retrieval System (obsolete; Replaced With AFS) |
 | GEBCO | General Bathymetric Chart Of The Oceans |
 | RTS | See Entry |
 | TRA | Technology Readiness Assessment |
 | MIRV | Multiple Independent Reentry Vehicle |
 | ZIP | Zoning Improvement Plan Code |
 | LATA | Local Access Transport Area |