blue box

noun
an electronic device used by phone phreaks to send out signals that unlock long-distance telephone circuits.

Origin:
1975–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
blue box
 
n
(Canadian) a blue plastic container for domestic refuse that is to be collected and recycled

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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FOLDOC
Computing Dictionary

Blue Box definition

operating system
The complete implementation of the Mac OS run-time environment on the more modern Rhapsody operating system. Blue Box is not an emulation layer; at any given time it will be based on the same source code and ROM image as the current version of Mac OS and will thus incorporate future Mac OS improvements.
(1997-10-15)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Either way, the big difference between the two kits seems to be that one comes
  in a blue box and the other comes in a pink box.
There's probably ten grand in dead caterpillars in his padlocked blue box.
When it comes to macaroni and cheese, there are some who believe you can't beat
  the blue box.
Carefully packaged to appeal to consumers, the pill is a pretty
  pink-and-lavender capsule, available in a light blue box.
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