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Reference.org
Windmill graph
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<p>In the <a href="/facts/Mathematics/pxTouaz4">mathematical</a> field of <a href="/facts/Graph_theory/VVPCd4TX">graph theory</a>, the windmill graph Wd(<i>k</i>,<i>n</i>) is an <a href="/facts/Undirected_graph/kw3eIBUe">undirected graph</a> constructed for <i>k</i> ≥ 2 and <i>n</i> ≥ 2 by joining n copies of the <a href="/facts/Complete_graph/AYD6hUqI">complete graph</a> Kk at a shared <a href="/facts/Universal_vertex/5YRHn7Y2">universal vertex</a>. That is, it is a <a href="/facts/Clique-sum/AkdxYjMR">1-clique-sum</a> of these complete graphs. </p>