This is a square but the top line has not be drawn. Originating front the center and going up is a arrow who's bottom of its head is equal to the top of the sides of the square
This Level Up 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.