Some wikis have configured their cite tool with an audiovisual template, i.e. gl.wikipedia.org, and they have a missing icon for it which doesn't look great.
https://www.mediawiki.org/wiki/VisualEditor/Citation_tool has more details on configuring it.
There are only 4 options there, it'd be nice to add maybe a music note one and a movie one clapper and or a combo music/movie one that people could choose from.
(Note that this is currently configurable by using Mediawiki:Common.css as well, so providing it as part of VE is not strictly necessary, see: https://github.com/wikimedia/mediawiki-extensions-VisualEditor/commit/be199c0bf2dda8086e4f3a2f46decb17ccf19935)