Symbol Undo Arrow Metal Sign

About the Undo Arrow design

A flat bar starts low on the left, runs right, then swings up through a broad half circle that bulges out past everything else on the sheet and doubles back along the top. The return stroke ends in a wide open V, two straight diagonals meeting at a sharp point with no crossbar closing them. That head is huge against the stroke feeding it, its arms spanning nearly half the height of the whole turn.