Online Encyclopedia of Western Signs and Ideograms Symbols.com

Symbol 21:1

2101

21:1 · A sign for strong fire or vigorous heating in alchemy. It is combination of 2801, the sign most commonly representing the element of fire in the Middle Ages.
    Compare with 1611 and 16111611, and with 2244 and 2452. They all have about the same meaning as 2101.