During the Main Quest, you'll need to guess a word that appears on a wall on the Rooftop of the Disco Inferno.
This step requires you to use the cipher alphabet to guess the letters for the word on the wall.
Below is a graphic of the cipher alphabet deciphered, as well as the complete wordlist. However, there's also an interactive
version of the cheat sheet to better help with the step without having to constantly recheck the graphic.
Just add your first
letter, then the word list will reduce down to the possible words remaining. You can also add you symbols you have on the rooftop
and it will futher reduce. Once you guess a letter, add it to the tool and it'll keep reducing the wordlist till it know's for sure
what your word is.