| Acronym | Meaning |
 | PH | Parts Of Hydrogen (acidity/alkalinity Index) - Picohenry |
| PSI | Portable Source Initiative |
| LIE | Liechtenstein (ISO 3166 Trigram) |
| ITER | International Thermonuclear Experimental Reactor |
| UE | Unit Of Employment |
| BT | Bathythermograph -Bhutan (FIPS 10-4 Country Code; ISO 3166 Digram) - (ii) BitTorrent - (iii) British Telecommunications Plc |
| IDA | U.S. Institute For Defense Analyses - International Development Association (part Of The World Bank |
| DGPS | Differential GPS |
| STI | Sexually Transmitted Infection - Subaru Tecnica International |
| WTO | World Trade Organization |
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