Idea of PowerPoint Icon
It's a letter P with a small section of the straight line in the upper left missing. The stylized P is on a modified rectangle that is drawn to look like a sheet of paper with the upper right corner creased and folded forward onto itself. The P is centered from left to right, and closer to the bottom of the page than the top.
This PowerPoint 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 6,100 icons, all in the same style and quality.