A Moorish Arch or Horseshoe arch or Keyhole Arch was a style historically developed in the western Islamic world which included al-Andalus, Morocco, and much of Algeria and Tunisia. The term "Moorish" comes from the European designation of the Muslim inhabitants of these regions as "Moors". Historical Note: Al-Andalus, also called Muslim Spain was a kingdom that occupied much of the Iberian penisular from 711CE until the early 11th century. The Arabic name Al-Andalus was originally applied by the Moors to the entire Iberian Peninsula In the 11th century, when European Christians began to reconquer the peninsula, Al-Andalus, or Andalusia, came to mean only the area still under Muslim control and thus became permanently attached to the modern-day region.
Geometrically it is a staightforward construction from two centres. By experimenting with where you place the two centres, you can explore different designs
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