Icon of a dark blue hexagon. This is the blank icon of the set with an edge at the top rather than a vertex
<a href="//commons.wikimedia.org/wiki/User:Themadchopper" title="User:Themadchopper">Themadchopper</a> et a.
Own work based on: <a href="//commons.wikimedia.org/wiki/File:Up_arrow.gif" title="File:Up arrow.gif">Up arrow.gif</a> <i>by</i> <a href="//commons.wikimedia.org/wiki/User:John_Cross" title="User:John Cross">John Cross</a>