Zalgo

Etymology
Said to have been coined in 2004 by Dave “Shmorky” Kelly as the name of a mysterious malevolent entity appearing in webcomics and creepypasta.

Noun

 * 1)  In full Zalgo text: text that appears corrupted or creepy due to the deliberate overuse of diacritics.
 * See also:
 * See also:

Proper noun

 * 1)  A notional entity said to be "released" due to unpredictable program behaviour resulting from an API's inconsistent use of synchronous versus asynchronous operations.