The tonsure, hair shaved as a sign of devotion, is read as giving up vanity for a deeper commitment. Dream books see it as renunciation, humility, or a visible mark of a choice you have made.
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.