A silhouette gives the outline without the detail, so it is read as someone known only partly, or a part of yourself not yet fully seen. Dream books note how easily the gaps get filled in with hopes or fears.
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.