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An 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.