Group icon, used in <a href="//commons.wikimedia.org/wiki/File:Wikipedia_Education_Program_Case_Studies.pdf" title="File:Wikipedia Education Program Case Studies.pdf">File:Wikipedia Education Program Case Studies.pdf</a> to denote Collaboration.
David Peters, EXBROOK, for Wikimedia Foundation
CC BY-SA 3.0
<a href="//commons.wikimedia.org/wiki/File:Wikipedia_Education_Program_Case_Studies.pdf" title="File:Wikipedia Education Program Case Studies.pdf">File:Wikipedia Education Program Case Studies.pdf</a>