Can someone identify this icon (looks like a ear) in the notification bar? (Asking this question for a friend)

What is the icon to the left of the GPS icon in the notification bar? The one that looks like an ear?
It's supposed to represent a hearing aid, and it means that Hearing Aid Compatibility is enabled.

It should go away if you go into the call settings and disable the hearing aid option. It'll either be something like Settings-&gt;Calls or pressing the Menu button on the dialer to get into the call settings (I think it varies some).

Supporting source, second source