A better image, but of the Avidyne Entegra, is here (about a megabyte):

http://www.avidyne.com/HighRez/P_Entegra_PFD.jpg

The black and white pyramid is the "ball" - when the top and bottom are
aligned then you're in trim.

I'm flying a (rental) Cirrus SR20 with this system these days, and
although I absolutely love the Avidyne/Garmin system I'm still not used
to this representation of coordination - it doesn't lend itself to "step
on the ball" very well. That said, and I keep forgetting this when I'm
flying, the SR20's backup AI has a conventional ball-tube mounted on it.

Dave Blevins

On 29 Dec 2003 05:31:09 -0800, (Mike Long) wrote:

Under the arc at the topmost part of the screen (the arc is the rate
of turn indicator), you will see a small trapezoid. This is the "ball
indicator" and shows skids and slips by moving in the appropriate
direction. It's in a very logical place and is an easy-to-monitor
indication.

This photo cut off for some reason but you can still see the white
reference point for turn rate (top) and the trapezoid below for the
ball, both on the left hand screen very top.

http://www.pbase.com/image/24574624/original