The Dragot is the wizarding currency of the United States (Pm). The symbol for the Dragot is a stylized capital D with a line through it (WFT).
Perhaps a combination of "dragon" and "ingot" (a bar of metal such as gold or silver). Rowling did state that the name of the Wizarding bank was derived from the word "ingot," for what it's worth.
From the Web
Pottermore: History of Magic in North America by J.K. Rowling
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