The shape is a line with a downward curve at the right end, like something coming back around.
This tactile icon is used for the reheat control on ovens and microwaves. It should also work with interfaces that have a redo control. Redo visual icons usually include an arrow at one end but there is not enough space for an arrow to be useful.
There are many nuances to this design - the horizontal length, the angle of the curve, thickness variation, the vertical length. In general the tactile icon works well as long as there is enough material for the adhesive to make a strong bond.