This is a image of a doubled-sided arrow. The arrow is tilted, with one side pointing towards the lower left corner and the other side pointing towards the upper right corner.
This Enlarge 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 5,700 icons, all in the same style and quality.