You're seeing just the function unused_atoms, go back to Nostrum.Util module for more information.

Since we're being sacrilegious and converting strings to atoms from the WS, there will be some atoms that we see that aren't defined in any Discord structs. This method mainly serves as a means to define those atoms once so the user isn't warned about them in the Nostrum.Util.maybe_to_atom/1 function when they are in fact harmless.