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The Free On-line Dictionary of Computing (foldoc)

1. Anything that requires {heavy wizardry} or {black art} to
{parse}: core dumps, {JCL} commands, {APL} or code in a
language you haven't a clue how to read. Not quite as bad as
{line noise}, but close.

Compare {casting the runes}, {Great Runes}.

2. Special display characters (for example, the high-half
graphics on an {IBM PC}).

[{Jargon File}]