/ ˈskwɪgl; NAmE / noun
a line, for example in sb's handwriting , that is drawn or written in a careless way with twists and curls in it :
Are these dots and squiggles supposed to be your signature?
► squig·gly / ˈskwɪgli; NAmE / adjective
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WORD ORIGIN
early 19th cent.: perhaps a blend of squirm and wiggle or wriggle .