Definition of squiggle noun from the Oxford Advanced Learner's Dictionary

 

squiggle

 noun
noun
BrE BrE//ˈskwɪɡl//
 
; NAmE NAmE//ˈskwɪɡl//
 
 
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a line, for example in somebody’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? Word Origin early 19th cent.: perhaps a blend of squirm and wiggle or wriggle.
See the Oxford Advanced American Dictionary entry: squiggle