This icon is a part of a collection of Puzzle flat icons produced by Icons8. Icons follow the guidelines of iOS, Windows, and Android and are designed by a single designer, guaranteeing the consistent quality.
This is a corner puzzle piece -one that would go in the southeast corner of a puzzle. The shape is roughly square. There is a protruding nub on the top. On the left is a space where the protrusion from another piece would fit.