from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A spiral-shaped graphic used to indicate swearing in comic strips.
- n. A string of typographical symbols, especially "@#$%&!", used (especially in comic strips) to represent an obscenity or swearword.
- n. A series of violence related images in a speech bubble to represent obscenity or swearwords
Apparently coined by American cartoonist Mort Walker circa 1964. (Wiktionary)