This icon is a part of a collection of Hełm zbroi 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's a logo of Armored Helmet reduced to a picture of small mid evil helmet. The helmet goes on top of people's heads often paired with a suit of armor for protection during battle. It is like a bike helmet but covered in metal and has face guards as well.