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Bowen Knot - Wikipedia
The looped square (⌘) is a symbol consisting of a square with outward pointing loops at its corners. It is referred to by this name, for example, in works regarding the Mississippian culture.[1] It is also known as the place of interest sign[2] when used on information signs, a practice which started in Finland in the 1950s, spreading to the other
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It is an ancient symbol used by several cultures, and remains in common use today. It belongs to a class of symbols which are called valknute in Norway.[4]
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The apron and its symbolism
By Bro. F.R. Worts, M.A., P.A.G.D.C.
HISTORY OF THE APRON1
There can be no doubt that the Masonic apron has been developed from the apron worn by operative masons in the middle ages. The few examples surviving show that the operative apron was fashioned from the skin of an animal, most probably a sheep. It was large enough
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