This icon is what looks to be a rectangular piece of paper with the top right edge of it folded down. That edge forms a right angle. On the bottom right is a huge X.
This Delete File 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 6,200 icons, all in the same style and quality.