Grawlix (noun)
graw-liks
A string of typographical symbols (such as %@$&*!) used in place of an obscenity, especially in comic strips.
1960s: coined by Mort Walker (1923–2018), US creator of the comic strip Beetle Bailey, apparently as a nonsense word.
Example sentences
“The replacement of the bad words with the grawlix made it suitable for all ages.”