This icon is a part of a collection of NEF 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.
The icon is depicting a sheet of paper. The top right corner is folded down, forming a right triangle pointing inwards towards the center of the paper. The bottom of the triangle is about 1/5 of the way down the page. In the center of the paper are the letters NEF all capitalized.