This Rewind icon is made in Material Design style developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 4,400 icons, all in the same style and quality.
The icon is a rewind or back symbol. It consists of two triangles pointing to the left or backwards. Both triangles touch each other, with the second triangle having its apex obscured or abutted into the first triangle.