File:24px-Gear icon.svg.png

Title: (or description)
Gear icon, also known as OOjs_UI_icon_advanced.svg

Author: (or citation)
MWGalloway (WMF), Apr 4, 2014.

Source: (e.g. internet address)
https://commons.wikimedia.org/wiki/File:OOjs_UI_icon_advanced.svg

Other information:
Used by the Reference-tooltips gadget user preference, see MediaWiki:Gadget-ReferenceTooltips.css