The skull is an old symbol of mortality and of what remains when everything else is stripped away. Tradition reads it as a reminder of essentials, or as an ending that clears space for change.
Where in your waking life have you met something like this lately?
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.