This icon looks like a diagonal soccer field. The icon overall is a diagonally oriented rectangle with two small rectangles on each short side and a line bisecting the rectangle with a small circle at its midpoint.
This Stadium 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.