Zero is read as both emptiness and pure potential — nothing yet, and room for anything. It can stand for a fresh start, or for the feeling of starting from nothing.
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.