Acronym |
Definition |
| TO | Tonga |
| TOFC | Trailer-On-FlatCar |
| TP | East Timor |
| TPMR | Third Party Mail Relay |
| TPO | Travelling Post Office |
| TPO | Transfer Post Office |
| TQM | Total Quality Management |
| TR | Turkey |
| TRL | TRaiL |
| TRLR | Trailer |
| TT | Trinidad and Tobago |
| TTC | Technical Training Center |
| TV | Tuvalu |
| TW | Taiwan |
| TZ | Tanzania |
| UA | Ukraine |
| UAA | Undeliverable As Addressed |
| UAE | United Arab Emirates |
| UG | Uganda |
| UK | United Kingdom (Great Britain) |
| UM | US Minor Outlying Islands |
| UN | Unit |
| UPPR | Upper |
| UPS | United Parcel Service |
| UPU | Universal Postal Union |
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