Notation
The name "converse" arises because the reversal of arrows corresponds to taking the converse of an implication in logic. The name "transpose" is because the adjacency matrix of the transpose directed graph is the transpose of the adjacency matrix of the original directed graph.
There is no general agreement on preferred terminology.
The converse is denoted symbolically as G', GT, GR, or other notations, depending on which terminology is used and which book or article is the source for the notation.
Read more about this topic: Transpose Graph