Spoiler: it’s not short for U.S. Take the trademark symbols, for example: means registered; means copyright; and TM means trademark.
Fahrenheit (F) and cents () are equally easy to understand.
In her reply, she states: “Incidentally, do you know where that sign comes from?
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It stands for the initials of the United States.”
Over time, the bottom of the U disappeared, leaving the S with two lines through it.
Later it was simplified to only one line.
That makes sense, right?
Cartwright M. The silver of the conquistadors.
August 15, 2022.https://www.worldhistory.org/article/2049/the-silver-of-the-conquistadors/.
History of U.S. Currency.
U.S. Currency Education Program.https://www.uscurrency.gov/history.