Tvimadur

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Tvimadur is a special rune used in the Runic calendar to represent the golden number 18.

Because this system needed 19 runes to represent the 19 golden numbers which stood for the 19 years of the perpetual calendar's cycle, the Younger Futhark, a Runic alphabet, was insufficient, having only 16 characters. The solution devised was to add three special runes to represent the numbers above 16: Arlaug (Golden Number 17), Tvimadur (Golden Number 18), and Belgthor (Golden Number 19).

The "Wendehorn rune" of Germanic mysticism is similar in shape.