The Expand icon is made up of four arrows, the arrow head is a right angle and the shaft is a straight line. The arrows start around the center of an invisible square and the arrows point to a corner of the invisible square. The arrow heads each make a corner of the invisible square.
This is a Expand icon. It is available in PNG and vector. Downloading is free for PNGs up to 100x100px.
Idea of Expand Icon by Andrew Skalkin
We've received the idea on February 9, 2013 and created the icons on March 16, 2013