English: Autism infinity symbol. From left to right, the symbol is gradientally colored in with red, then orange, yellow, green, blue, and finishing with purple. An alternative to puzzle piece autism symbols, which are strongly disliked by many adults on the spectrum: https://web.archive.org/web/20130113021924/http://unpuzzled.net/
This is not my favorite variant of the concept (there are many), but it's the only one I've found with explicit licensing info that is Wikipedia-acceptable.
Licensing
Public domainPublic domainfalsefalse
This image of simple geometry is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship.