The sign for "librarian" in American Sign Language (ASL) is to extend your index finger and middle finger together, and then move your hand back and forth across your forehead. You can take a look at our content about librarian in asl that we have compiled from all of sources.
In this ASL Basics video, you will learn how to sign many signs related to the library, such as “book”, “library”, “librarian”, “read”, and many more.
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https://www.youtube.com/watch?v=_ZWjG1xYc4g