This is a conversion of the Material Design Icons library into Factorio signals. Currently this includes all 7447 icons from MDI and sorts them by their first segment of the icon name, alphabetically, in their own category in the UI

I would strongly recommend for looking up specific icons, using the search tools provided by Pictogrammers: https://pictogrammers.com/library/mdi/

Does this probably add way, way, way too many signals that you may never use? Yes. Is it useful when you need "an icon to represent exactly this action" Yes.

I had a need for it myself and figured I would share it with all of you as well!