I’m sure some of you have absolute monstrosities of sigils (I know I do, in my .zshrc alone). Post them without context, and try and guess what other users’s lines are. If you want to provide context or guess, use the markdown editor to spoiler-tag your guesses and explanations!
I don’t have a riddle and I can’t read Bashisms. In posix shell the most unreadable things are parameter expansion, but compared to the lines OP posted they seems straight forward.