This icon is a part of a collection of Człowiek z żelaza 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. Both PNG and vector are available.
It is the head or mask of Iron Man. It is head-shaped, with two smaller slits for the eyes. It has small protrusions for the ears on each side about halfway up the mask. There is also a frontal faceplate within the mask.