What does A mean in a trifecta?

by mike
(new jersey)

American Pharoah

Trifecta finish was 8-1-2. The board posted 8-1 -A

Answer: Please supply details of race in question - date, track, race time or No.

Thanks for info supplied in comments -

"All" refers to the track paying out the trifecta ticket for all the runners in the 3rd position.