Idea of Create Document Icon
It's a icon for you to Add a rule which is a picie of paper with a plus mark. If you need to add a rule this is the button/icon you would go to.
This Create Document 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.