A font containing scalable vector icons
fontawesome-5.6.3-1-any
FontAwesome contains over 600 icons and is most widely used on the internet to depict certain actions. Haiku's discussion forum at https://discuss.haiku-os.org uses it as well.
As long as Haiku doesn't support loading a font that's not installed, you should install this webfont to see all the icons on the discussion forum.