SoSpaceballButtonEvent(3) on Linux
The text 0d6a43a350e2, as Debian 7 (Wheezy) shipped it.
The SoSpaceballButtonEvent class contains information about spaceball button interaction. When the user presses any buttons on a spaceball device, these will be translated from a system specific event into a Coin event and sent to the scenegraph by using instances of this class.