A symbol noticed as a symbol is read as meaning trying to surface — one thing standing for another. Dream tradition suggests asking what the sign recalls for you personally, since that is where its message lies.
When this appeared in your dream, what were you feeling?
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.