Odd numbers cannot be split evenly, so tradition reads them as dynamic, unresolved and individual. In a dream they suggest something left over or a situation still in motion.
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.