Node
From WoWWiki
A node is a point of interaction. Specifically, a node may refer to a vertex on a graph, like a destination on a flight path map. A node can also refer to a resource node, such as the five found in Arathi Basin. Resource nodes may also refer to the place where herbs and ore spawn. Generally, a node can be any point at which entities spawn, like graveyards or starting locations in battlegrounds.
In Wrath of the Lich King
The new resource nodes for the new metal cobalt are also called nodes as of the βeta:
