EntityQ512604· pop 19· linked from 147 articlesloopSign in to saveedge connecting a vertex to itselfConnectionsgraphEntitydegreeEntityglossary of graph theory termsEntityInternational Standard Book NumberEntitygraph theoryEntityMöbius stripEntityKlein bottleEntityNational Institute of Standards and TechnologyEntitynodeEntitydirected graphEntitycycleEntityloopless multigraphEntityneighbourhoodEntitycopyright status of works by the federal government of the United StatesEntitymultiple edgesEntitystrange loopEntityMöbius ladderEntityCategoriesGraph theory objects