Idea of Outline Icon
This is a picture of a paper with a space on top where the title would be. In the middle of the paper is four lines that are spaced apart, showing writing probably. It seems to be an outline of sorts.
This Outline 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.