An ice cube tray divides into small frozen portions, and dream books read it as feelings kept cool and in neat compartments. It can stand for preparing ahead to calm something down.
Does the traditional reading fit your dream, or did it mean something else to you?
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.