Idea of Expand Arrow Icon
The Expand Arrow icon looks like the tip of an arrow, without the shaft, pointing down to the bottom of the page. It also looks like an upside-down equilateral triangle, only without its base.
This Expand Arrow 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.