Hide the Audio Source Icon in Unity

In the scene editor, audio sources render with a screen space aligned icon of a speaker which helps you see which objects have sounds attached to them.
However this also obstructs your view of the object and can be confusing if you have a lot of audio sources.  Fortunately it is easy to toggle on and off from the gizmo rollout.  You can also use this to toggle other features displayed in the editor.  Quite handy!