1. 
   BTR
   Bit Test and Reset
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   BTR
   Bail To Return
   Found op http://www.met.police.uk/foi/glossary.htm
   
   
3. 
   BTR
   [album] BTR is the debut studio album by Big Time Rush, the Nickelodeon television series and boy band. Released on October 11, 2010, the track listing for the album was announced on September 1, 2010. The album was preceded by the release of several promotional singles, including their self...
   Found op http://en.wikipedia.org/wiki/BTR_(album)
   
   
4. 
   btr
   1) Bit test and reset
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/btr/1
   
   

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