BraidAn intertwining of strings attached to top and bottom ``bars'' such that each string never ``turns back up.'' In other words,the path of a braid in something that a falling object could trace out if acted upon only by gravity and horizontal forces. See also Braid Group References
Christy, J. ``Braids.''http://www.mathsource.com/cgi-bin/MathSource/Applications/Mathematics/0202-228.
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