Emptiness in a dream is read as a space where meaning or connection used to be. Dream books see it as an invitation to notice what is missing, and as room for something new to arrive.
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.