The librarian is read as the keeper of knowledge and order. Meeting one in a dream is linked with finding the right information, or with feeling quietly hushed.
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.