There are two parallel lines that form three sides of a rectangle with the bottom of the rectangle cut short. There are two parallel lines pointing down from the top of the rectangle and two curved lines connect the two lines at the bottom.
This Swingset 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.