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Reference.org
Clebsch surface
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<p>In mathematics, the Clebsch diagonal cubic surface, or Klein's icosahedral cubic surface, is a non-singular <a href="/facts/Cubic_surface/jCvavESm">cubic surface</a>, studied by Clebsch (1871) and Klein (1873), all of whose 27 <a href="/facts/Exceptional_line/meaMWRGR">exceptional lines</a> can be defined over the real numbers. The term Klein's icosahedral surface can refer to either this surface or its <a href="/facts/Blowing_up/YejuoWYu">blowup</a> at the 10 <a href="/facts/Eckardt_point/jCvavESm">Eckardt points</a>. </p>