[s-cars] Warning light on dash

[Lee Levitt]

Patient is a '96 A6 quattro avant. There's a warning light on the dash that
I can't identify. It's to the right of the main cluster, in the warning
light area (not part of the autocheck). Green light, looks like two lights
facing one another. I would have thought that this is a bulb out indicator,
but that's in the autocheck, and as far as I can tell, all the exterior
lights are working fine.
 
The light comes on with the ignition.
 
Can someone identify this warning light?
 
Thanks,
 
Lee
'96 A6 quattro avant
'95 A6 quattro avant
'93 Mercedes 300D 2.5 turbodiesel