One of the most important signs in sign language, you can use “who” to clarify exactly who the signer is talking about. Sometimes, when things aren’t clear, this is an easy sign to interject with to get clarity.

Since "who" is a wh-question word, your eyebrows should be furrowed or lowered (a typical facial expression for wh-questions in ASL). This is an important aspect of the sign, as it conveys that you're asking a question.
Learn who to sign other important "W" words in sign:
Who | What | Where | Why | How
Learning to sign is a great start. For the moments that have to be right (a medical appointment, a parent-teacher meeting, a legal conversation) Ava connects you with a credentialed ASL interpreter over video in the Ava app, on demand or scheduled ahead. Available 24/7, with live captions included.