What does a wedge in a graph look like? I am reading Decompositions of Triangle-Dense Graphs by Gupta et al. 

On page 2, in Definition 1 what is a wedge in a graph? 

I know what triangle is but I don't know what wedge is and google isn't helping!
They say it in the paper.


  Let a wedge be a two-hop path in an
  undirected graph.


So it is a path with 2 edges, like 2/3 of a triangle.