I think I mentioned grawlixes here before, but the first two I don’t recall, even though I read the book.
The words come from a book named The Lexicon of Comicana the American cartoonist Mort Walker. It was intended as a tongue-in-cheek look at the devices used by cartoonists. Walker invented an international set of symbols called symbolia after researching cartoons around the world. (Taken from Wikipedia)