Hi edetroit,
It's been a long while, but I seem to remember the annunciators were triangular and able to display up to 3 sides each (hence the two test buttons to be able to view all 3 sides).
More pictures here.
L1011 TRISTAR Panel Installation & Handling Notes | HJG Message Boards
Last edited by rudderrudderrat; 2nd Dec 2014 at 22:00.
Reason: deleted confusing text