Greek Cross
A Greek cross, also called a square cross, is a cross in the shape of a plus sign. It is a non-regular dodecagon.
A square cross appears on the flag of Switzerland, and also on the key to the Swiss Bank deposit box in D. Brown's novel The Da Vinci Code (Brown 2003, pp. 146 and 171-172).
Greek crosses can tile the plane, as noted by the protagonist Christopher in The Curious Incident of the Dog in the Night-Time (Haddon 2003, pp. 203-204).
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Wang's conjecture
