Favicon
A favicon is the little icon that shows up next to the URL or tab when visiting a site. For example, Meta-Wiki's favicon is viewable here: <https://meta.wikimedia.org/favicon.ico>.
Wikipedia
In April 2013, the Wikipedia favicon was updated.
Wiktionary
Because Wiktionary has multiple logos, it has multiple favicons.
[FIXME: add links!]
Default
The default Wikimedia favicon is viewable here: <https://bits.wikimedia.org/favicon/wikipedia.ico>.
See also
- wgFavicon on Wikimedia wikis