Game logic can have two types of waypoints, AND and OR. The Wiki says:
AND: Only available for groups on the Game Logic side. This waypoint will not complete until all waypoints it is synchronized with have been completed.
OR: Only available for groups on the Game Logic side. This waypoint will complete when any one of the waypoints it may be synchronized with has been completed.
In general, though, they work with triggers as well as waypoints (verified to work in Arma 2)
In Arma 3, OR waypoints always immediately fire regardless if any of the synchronized triggers or waypoints were activated or not. {F23448}