Status bar icon that looks like a silhouette of a person with sound waves on the right

Today, I (very briefly) spotted a new icon in my status bar on Samsung Galaxy Note 9. It looked like a little person icon (head and shoulder, silhouette kind of thing) with sound waves on the right (like a WiFi signal but horizontal). It was only there for a second, so I wasn't able to get a screenshot but will definitely try if I see it again. I haven't come across this icon in the 8 or so years that I've been using Android, and I can't think of any obvious app that it would be for. I haven't installed any apps in the last week or so either. If it helps, I was on my Galaxy Note 9 on Oreo (8.1.0 / Samsung Experience 9.5), it is rooted (Magisk) and has Xposed installed. Any help identifying this icon is greatly appreciated and I'll update if I manage to get a screenshot.