This is an iron plate inscribed with the 6x6 Magic Square in Arabic numerals from the 14th century. The 6x6 Magic Square was found in the palace foundation of Mongolian Prince Anxi to ward off the evil spirits.
This represents primary evidence of magic square usage in the daily lives of the royal family. The set of higher order Magic Squares were a part of the cosmological system of the early Chinese. The 6x6 Magic Square represents the Sun, perhaps the most important magic square in alchemy, with the exception of the 27x27 Magic Square, which was also known as the square of the Sun.
The significant numbers of the 6x6 Magic Square: the magic constant of the square is 111, and the sum total of all the numbers in the square is 666, the Mark of the Beast. This square has been referred to in the Bible, but most likely has Chinese origins.
More information on the above iron inscribed magic square: Arabic 6x6 Magic Square
