grawlix
n.— «Mort Walker of “Beetle Bailey” fame invented a cartoon vocabulary called Symbolia that we cartoonists make use of from time to time. According to Mr. Walker, that little set of typographical symbols that stand for obscenities are called “grawlixes.”» —“Tired of wide pages? Grawlixes won’t help” by Debbie Kornmiller Arizona Daily Star (Phoenix) Jan. 29, 2006. (source: Double-Tongued Dictionary)