The torii marks where the everyday world ends and sacred ground begins. Passing beneath one is read as crossing into a more attentive, respectful state of mind.
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.