Interesting. https://free-software-logo.codeberg.page/ by @firstname.lastname@example.org suggests a logo for Free Software. It’s licensed as CC0 (No copyright) for free use. This can be used to indicate #FOSS / #FLOSS instead of using a company logo like e.g. from GitHub Inc., that may be used to _host_ free or open software but has a distinct logo of it’s own (the Octocat logo is a registered trademark).