| Acronym | Meaning |
| HCT | Higher Colleges Of Technology |
| DSD | Defence Studies Department (King's College |
| RT | PCR -Real Time Polymerase Chain Reaction Or Reverse Transcriptase Polymerase Chain Reaction. Clarified With Real Time RT-PCR Or Reverse Transcriptase RT-PCR Where Appropriate. |
| UIUC | University Of Illinois At Urbana-Champaign |
| TLD | Thermoluminescent Dosimeter - Top-Level Domain |
| UCR | University Of Costa Rica |
| OCS | See Entry |
| IATA | International Air Transport Association |
| PPA | Parahippocampal Place Area - PolyPhthalAmide |
| UPU | Universal Postal Union |