The dollar sign, also known as the peso sign, is a currency symbol consisting of a capital S crossed with one or two vertical strokes ($ or depending on typeface), used to indicate the unit of various currencies around the world, including most currencies denominated "dollar" or "peso".
A dollar sign ($) is the symbol found on the same key as the number four (4) key on United States QWERTY keyboard. The dollar sign represents a U.S. currency value, e.g., $10.00 for ten dollars.
Why is the sign for the dollar, a word with no S's, so clearly based on the letter S? Here's the story behind it—and why it wasn't always a "dollar" sign.
If you’re wondering where the dollar sign ($) came from, you’re in good company. No one really knows for sure, and several theories have emerged over the years.