Symbols.com - Symbol 25:18: "25:18 · In Germanic countries this structure is called St. Hans' cross or the cross of St John. In Scandinavia it is a magic ideogram from the Viking era, or even older. It seems also to have been used in Cabbalistic mysticism. Today, it is used as a cartographic and traffic sign to denote ancient remains or an ancient monument. On maps and are sometimes used as its synonyms.
As a traffic sign it is inserted in a square denoting the ground: .
Compare with for prehistoric site, and with in Group 27.
also appears in pre-Columbian America, where it is associated with ."
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