Where would you be likely to find JARNS, NITTLES, QUIMP, and GRAWLIX?

JARNS, NITTLES, GRAWLIX, and QUIMP
Various squiggles used to denote cussing in comic books.

@#~~~*, you got it Sammy.

JARNS-look like a counterclockwise spiral and the symbol for 'number' sometimes with more lines
NITTLES-look like crude asterisks
GRAWLIX-look like a jagged horizonal line with small peaks, or a hand drawn EKG read-out with minimal activity
QUIMP-looks like a small sombrero

See here for examples.