In reference to the 9001KA3 contact block, what does the circle with the arrow inside it mean?

Issue:
Meaning of  the circle with the arrow inside  on 9001KA3


Product Line:
Harmony 30 mm 9001 SK Plastic Push Buttons

Environment:
30 mm Push Button and Operators

Resolution:
It is a positive opening contact.

Released for: Schneider Electric USA