A plank can bridge a gap or form a floor, so tradition reads it as support and a way across. Walking a narrow plank in a dream is read as a precarious step taken with care.
Does the traditional reading fit your dream, or did it mean something else to you?
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.