Why the Dollar Sign Uses an 'S': the Untold History Behind the World's Most Famous Symbol

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Q1: Why does the dollar sign use an S instead of a D?
The symbol does not come from the English word "dollar." It evolved as a handwriting abbreviation for the Spanish "peso" (written as "ps"). As accountants wrote the letters rapidly over each other, the "P" lost its loop, leaving a single vertical stem through the "S."

Q2: Does one vertical line mean something different than two?
No. Both the single-bar ($) and double-bar variants represent the exact same currency symbol. The double vertical bar reflects either an alternate tribute to the twin Pillars of Hercules on Spanish silver coins or an artifact of overlapping the two vertical edges of a letter "P." Today, both are recognized under Unicode as identical semantic characters.

Q3: Was the dollar sign created by the United States government?
No. The United States government never officially legislated or copyrighted the design of the dollar sign. The symbol emerged organically among international merchants in the mid-1700s and was later adopted into federal ledgers and private type foundries after the Coinage Act of 1792.

Q4: Why did Spanish coins circulate in the United States for so long?
The US Mint struggled with raw bullion shortages during its early years and could not strike enough coinage to meet market demand. As a result, Congress granted Spanish silver coins legal tender status until the passage of the Coinage Act of February 21, 1857, which officially banned the domestic use of foreign currency.