Citizens' Band radio (often shortened to CB radio) is, in many countries, a system of short-distance radio communications between individuals on a selection of 40 channels ...
http://en.wikipedia.org/wiki/Citizens%27_band_radio

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CB Radios Plus provides a large selection of electronic equipment from leading brands such as Connex, Galaxy, Cobra, Uniden, Midland and Cherokee.
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CB (or derivative) may refer to: Architectural/engineering. Block coefficient (Cb), determining fullness of ship's hull; Chrysler Building, a skyscraper in New York City, New York
http://en.wikipedia.org/wiki/CB

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