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- (metrology) Symbol for terajoule, an SI unit of work or energy equal to 1012 joules.
- The ISO 3166-1 two-letter (alpha-2) code for Tajikistan.
- Abbreviation of . (a city in Mexico just south of the American border)
- 2016, Mike Salazar, Steak & Cherry Pie:
- That was when Customs stopped every car at the S. D. border and checked for drugs, which reminds me of the first time I went to TJ—Tijuana, Mexico.