A warning sign is read as an inner alarm — a part of you asking for attention or caution. Dream books treat it as a prompt to slow down and look, not as a forecast of trouble.
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.