The iceberg is the classic picture of what lies hidden: only the tip shows, the bulk stays below. Tradition reads it as an unseen issue or feeling far larger than it appears.
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.