What's the correct term for a "undirected cycle" in a directed cycling graph - when there's more than one path between nodes? I'm calling them "diamonds", but is there a better term?

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What's the correct term for a "undirected cycle" in a directed cycling graph - when there's more than one path between nodes? I'm calling them "diamonds", but is there a better term?

arbitraryundirected cycles, or only undirected cycles composed of two directed paths? $\endgroup$ – JeffE Jun 1 '12 at 7:38