30:16 · This sign structure is found on Nordic Bronze Age altars and in prehistoric Egypt. is also a heraldic sign known as a mirror. As a Bronze Age ideogram it was most probably a sun symbol.
    Compare with the Mayan cross, , and with , found in ancient Troy and made up of five sun signs and an arrow cross.
    In eighteenth-century chemistry this sign was used for saccharum or sugar.
    The same structure, but with a filled inner circle, , is a modern German map sign for radio beacon (the sign is a synonym).
    In August 12 1989 this structure was a crop circle in southern England.