(thing) by hobyrne Fri Aug 03 2001 at 3:39:38

Two bits. Halfway (logarithmically speaking) between a bit and a nybble. A unit of information with 4 states, or values.

Source: Donald Knuth's fascicle number 1, currently available for download from:
http://www-cs-faculty.stanford.edu/~knuth/taocp.html

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