A no entry sign marks a door or road that stays closed to you. It is commonly read as a boundary, set by others or by yourself, around something you are curious about.
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.