From Longman Dictionary of Contemporary Englishsquigglesquig‧gle /ˈskwɪɡəl/ noun [countable] LINEWRITEa line with irregular curves Shorthand just looks like a series of funny squiggles to me. —squiggly adjective squiggly lines
Examples from the Corpus
squiggle• The map contained a squiggle in the center of the Rann, which was probably higher ground.• Her white satin evening gown was adorned with gold scrolls and squiggles of the sort that usually decorate formal window treatments.• a pattern of brightly colored squiggles• The Music Center's plan at present may have a lot of squiggles, but not much sizzle.• As we were heading due north, we would remain to the right, or east, of that squiggle.• In the middle of the squiggle, x marked a well.Origin squiggle (1800-1900) squirm + wriggle 