This image was copied from wikipedia:en. The original description was:   Image of a plus sign in 128-point Computer Modern (CMR10), created on my personal copy of Adobe Illustrator with assistance from LaTeXiT.
<ul><li><a href="//commons.wikimedia.org/wiki/File:PlusCM128.svg" title="File:PlusCM128.svg">PlusCM128.svg</a>: <a href="//commons.wikimedia.org/wiki/User:Maksim" title="User:Maksim">Maksim</a> and <a href="//commons.wikimedia.org/wiki/User:Indolences" title="User:Indolences">Indolences</a></li>
<li>derivative work: <a href="//commons.wikimedia.org/wiki/User:Marozols" title="User:Marozols">Marozols</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Marozols" title="User talk:Marozols"><span class="signature-talk">talk</span></a>)</li></ul>
CC BY-SA 3.0
<ul><li><a href="//commons.wikimedia.org/wiki/File:PlusCM128.svg" title="File:PlusCM128.svg">PlusCM128.svg</a></li></ul>