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- Used, in context, to shorten the name and simplify the pronunciation of a species name with a generic name beginning with T and a specific epithet of rex.
- In scientific publication, a genus name starting with T will only be abbreviated to T. after having first been given in full. See T. rex at Wikispecies for more. In popular use, T. rex is freely used, always with the meaning Tyrannosaurus rex.
- Abbreviation of .