A dowsing rod is an old folk tool for finding hidden water, read as trusting instinct to locate what you need. Dream books link it to searching for emotional nourishment beneath the surface.
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.