2 definitions found

From The Free On-line Dictionary of Computing (27 SEP 03) [foldoc]:

tr The {country code} for Turkey. (1999-01-27)

From Virtual Entity of Relevant Acronyms (Version 1.9, June 2002) [vera]:

TR Task Register (CPU, Intel, assembler, IC)
  Definitions retrieved from local copies of the freely distributed DICT client/server software and databases. Click here for database copyright information. -KM