The image is of a circle with a line through the top portion of it. The line is horizontal and above center. The line is solid and so is the circle and rays coming from the circle above the line. Below the line, the circle and the rays are dotted. In the center of the dotted part of the circle is the number 12 with a degree symbol.
This is a Horizon icon. It is available in PNG and vector. Downloading is free for PNGs up to 100x100px.