Dumb question: What IS a trigraph?

[2014_5001 at uwovax.uwo.ca]

Every so often someone mentions a trigraph.  What is a trigraph???
I have programmed in C for 3 years, and the only time I met the word was when I
was reading a graph-theory book (and I cannot remember what that definition
was).

Please enlighten me.


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-- 
Alexander Pruss, at one of: Department of Applied Mathematics, Astronomy,
Mathematics, or Physics                     University of Western Ontario 
pruss at uwovax.uwo.ca         pruss at uwovax.BITNET          A5001 at nve.uwo.ca