A combination lock opens only with the right sequence, read as a problem that needs the correct order of steps. Forgetting the code points to losing access to something once familiar.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.