The phrase "wiggly line" refers to a line that is not straight and instead moves or undulates in a curvy or squiggly manner.
Sentences with «wiggly line»
Steve: And then they are getting rid of it again, and you get this little kind of wiggly line, but the overall trend is up. (scientificamerican.com)
Those signals can be displayed as wiggly lines on a screen and, more usefully, are also converted into three measurements that market researchers care about: attention, emotion and memory. (newscientist.com)
«Salacion Touch - 3» (1978) is a lively pale liverish hue, with one little vertical wiggly line down the center. (lesliefeely.com)