undirected graph

A graph in which every link is associated with an unordered pair of nodes. See also undirected link.

undirected link

A link that has no specific direction. Contrary to directed links, undirected links have no ordering between both incident nodes. In a mathematical sense, a directed link is an ordered pair of nodes; an undirected link is an unordered pair of nodes. See also directed link and undirected graph.