An omen in a dream is read as your own intuition taking the shape of a sign. It reflects what you already sense about a situation rather than an outside message about what lies ahead.
Has this come up in your dreams before? What was going on in your life then?
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.