a/k pads on dark rift

does anyone know what the a/k pads are on the dark rift (and several other pcbs) , they are on the bottom just above the in and out pads....
 
thank you very much...i wanted to assume that but thot id double check...i did a search before i asked and didnt find this...mabe it will help someone else who is new...once again, thank you!
 
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