The Steiner surface reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Steiner surface

The Steiner surfaces are self-intersecting embeddings of the real projective plane into three-dimensional space. More particularly, they are linear projections of a six-dimensional embedding called the Veronese surface, which is the image of an ordinary 2-sphere centered at the origin under the map f(x, y, z) = (x², y², z², yz, xz, xy). There are ten different types, including the Roman surface and cross-cap.

They are named after Jakob Steiner who discovered them.

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