The back door is the informal or hidden way in and out. It is read as a discreet escape, a shortcut, or a sense that something is entering your life without going through the front.
Where in your waking life have you met something like this lately?
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.