The ash mark of Ash Wednesday is read as humility and a reminder of what is essential. Dream books link it to a season of reflection and to a wish to begin again with less.
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.