The Croatian cross is a stylized cross that is part of the baptistery of Croatian Duke Viseslav and dates back roughly 1000 years.
Croatian Cross
See also
CrossThis entry contributed by Mario Nikolic
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Nikolic, Mario. "Croatian Cross." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/CroatianCross.html