Petersen graph
/ˈpiːtəs(ə)n ˌɡrɑːf/ /ˈpiːtəs(ə)n ˌɡraf/Mathematics
noun
A graph having ten vertices and fifteen lines, which may be drawn as a pentagram within a pentagon, each vertex of the latter being joined by a line to the nearest vertex of the former.
Origin
1940s; earliest use found in Proceedings of the Cambridge Philosophical Society. From the name of Julius Petersen, Danish mathematician, who devised it + graph, after German Petersensche Graph.
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