Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Grawlix" Definition
noun
A series of violence related images in a speech bubble to represent obscenity or swearwords.
Source: Wiktionary
A spiral-shaped graphic used to indicate swearing in comic strips.
Source: Wiktionary
A string of typographical symbols, especially "@#$%&!", used (especially in comic strips) to represent an obscenity or swearword.
Source: Wiktionary
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