A business contact icon is a rectangle, but it isn't complete because at the bottom there are two half like circles that looks like someone hole punched it. In the rectangle there are two symbols, on the left there is a person and on the right there is an at sign.
Related to Contact Details Icon
Related icons are the icons with matching tags, as well as all business icons. All icons are in the same flat style. You can either download free PNG icons or buy SVG vectors