tr

TR is a two-letter abbreviation that can refer to multiple things depending on context. In geography and governance it is most commonly associated with Turkey, while in technology and science it appears in several specialized forms. This article summarizes the principal uses.

Geography and governance: As an ISO 3166-1 alpha-2 country code, TR designates Turkey. It is also the international vehicle registration code used on Turkish-registered vehicles, and the country code top-level domain for Turkey is .tr.

Computing and technology: In computing, tr is a standard Unix utility that translates or deletes characters from its input. In HTML, the tag <tr> defines a table row, used inside a table to group cells in a single row.

Mathematics and science: In mathematics, tr denotes the trace of a matrix, the sum of its diagonal elements.

Other uses: In taxation, TR is sometimes used as an abbreviation for tax return. In broader contexts, TR can appear as an initialism within longer names or models, depending on the field or organization.

Notes: The meaning of TR is highly context-dependent and may require clarification when encountered in ambiguous settings.