Bookends stand for limits that hold things in place. They are read as the beginning and end of a chapter, or as steady support keeping a part of life from toppling over.
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.