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An irregular Dodecahedron Cross shaped like a 
 sign but whose points flange out at the end: 
.  The
conventional proportions as computed on a 
 grid as illustrated above.
See also Cross, Dissection, Dodecahedron
References
Frederickson, G.  ``Maltese Crosses.''  Ch. 14 in Dissections: Plane and Fancy.  New York: Cambridge University Press,
  pp. 157-162, 1997.