| Rank | Abbreviation | Meaning |
|---|
| ***** | TRTA | Technical Road Transport Association
| |
| **** | TRTA | Tennessee Retired Teachers Association
| |
| **** | TRTA | Toms River Transportation Association
| |
| **** | TRTA | Tinnitus Retraining Therapy Association
| |
| **** | TRTA | Traumatic Rupture of Thoracic Aorta
| |
| **** | TRTA | Thoracic Aorta
| |
| **** | TRTA | Two Rivers Tennis Association
| |
| *** | TRTA | Tokyo Rapid Transit Authority
| |
| *** | TRTA | Tennant Research Technology Applications
| |
| *** | TRTA | Tumbler Ridge Teachers Association
| |
| *** | TRTA | Tennessee River Trail Association
| |
| *** | TRTA | Texas Rail Tourism Alliance
| |
| *** | TRTA | Teito Rapid Transit Authority
| |
| ** | TRTA | Teddy Roosevelt Terrier Association
| |
| ** | TRTA | Three Rivers Trail Association
| |
| ** | TRTA | Tahoe Rim Trail Association
| |
| ** | TRTA | Texas Rail Trail Alliance
| |
| * | TRTA | Tennessee Recreation Therapy Association
| |
| * | TRTA | Tri-River Transit Authority
| |
| * | TRTA | Trade-Related Technical Assistance
| |
| * | TRTA | Texas Retired Teacher Association
| |
| * | TRTA | Traders Road Transport Association
| |
| * | TRTA | Thai - Russian Trade Association
| |
| * | TRTA | Tennessee Recreational Therapy Association
| |
| * | TRTA | Tuscarawas Regional Technology Accelerator
| |