Wiktionary
directed edge
n. (context graph theory English) An edge of a directed graph.
Wikipedia
Directed Edge
Directed Edge is a Business-to-business startup that offers a recommendations engine, founded by Scott Wheeler and Valentin Hussong and funded by the seed-funding firm Y Combinator in the summer of 2009. The recommendations engine provides related-content suggestions and personalized recommendations for online stores, social networks and informational sites.