| Acronym | Meaning |
| 4G | Fourth-generation Mobile Telephone System |
| CFAR | Christine's - Federal Acquisition Regulation |
| SDC | Shaft Driven Compressor - U.S. Army Strategic Defense Command (1985?1992) |
| MON | Mongolian Language (ISO 639-2 Code) |
| NETCU | (UK) National Extremism Tactical Co-ordination Unit |
| UGX | Ugandan Shilling (ISO 4217 Currency Code) |
| MMW | Millimetre Wave (radar |
| 4D | Four-dimensional (usually Three Spatial Plus One Temporal Dimension |
| KUR | Kurdish Language (ISO 639-2 Code) |
| ARI | Acute Respiratory Infection - U.S. Army Research Institute For The Behavioral And Social Sciences |