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).
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Nearby terms: RUFL « run « RUNCIBLE « runes » runic » run-length encoding » Run Length Limited
