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I am looking for icon ideas on how to represent a smoothing quality. The icon will be used for a tool that will smooth out points on a jagged curve.
I'd suggest an icon that literally demonstrates the process you're trying to show:
Take a jagged circle, and turn it into a smooth one.
Similarly, take a jagged line and make it curvy.
I've also seen an iron used for this kind of functionality
Required, but never shown