Looped square

The looped square (⌘), also known as Saint John's Arms, Saint Hannes cross (related to Swedish sankthanskors, Danish johanneskors, and Finnish hannunvaakuna), and as the command-key symbol due to its use on the command key on Apple computer keyboards, is a symbol consisting of a square with outward pointing loops at its corners.

[6] In Finland, the symbol was painted or carved on houses and barns, and domestic utensils such as tableware, to protect them and their owners from evil spirits and bad luck.

The oldest surviving example is a pair of 1000-year-old (Finnish pre-Christian period) wooden skis decorated with the symbol.

[7][8] The looped square also appears on artifacts of the Mississippian culture of the southeastern United States.

[9] In modern times, the symbol is commonly found in Belarus, Denmark, Estonia, Finland, Germany, Iceland, Latvia, Lithuania, Norway, Sweden, and Ukraine as an indicator of locations of cultural interest, beginning in Finland in the 1950s and spreading to the other Nordic countries in the 1960s.