DOT (graph description language)

DOT is a language describing mathematical graphs (as used in graph theory, directed or undirected) in text-based form. Its files can have a .dot or .gv extension, the latter often preferred due to the former being confused with the DOT files formerly used for Microsoft Word template files.

Links

 * Wikipedia article
 * Official documentation/spec
 * Language info
 * Drawing graphs with dot (PDF)