Scribble is a new feature in iPadOS 14. It looks quite handy.
Jeff Richardson of iPhoneJD explains Scribble in this post:
“One of the interesting new features in iPadOS 14 is Scribble, the ability to use an Apple Pencil to write text into a text field instead of using the on-screen keyboard. I wasn’t sure how useful the feature would be when it was announced, but now that I’ve been using it, I really like it. When I then need to enter some quick text — such as to search for something in Safari or Mail — it is incredibly convenient to just write a few letters or words with the Pencil that is already in my hand…. If you haven’t tried it out yet, I encourage you to do so. It is yet another reason that the Apple Pencil makes me more productive in my law practice”