The US Dollar (USD), symbolized by $, serves as the official currency of the United States and several other countries. It ranks as one of the most traded currencies among forex traders and acts as a primary reserve currency under control of the Federal Reserve System, which functions as the US central bank managing banknote issuance.
Denominations: Coins and Banknotes
One US dollar equals 100 cents. Common circulating notes are $1, $2, $5, $10, $20, $50, and $100, with coins including 1 cent (penny), 5 cents (nickel), 10 cents (dime), 25 cents (quarter), 50 cents (half dollar), and 1 dollar.
Higher denomination notes of $500, $1,000, $5,000, and $10,000 exist but were withdrawn from circulation in 1967 due to the rise of electronic payments, making them rare collectibles worth more than face value today.
The $100,000 note, the highest denomination, was used only for internal government transactions and never entered public circulation.
Plans existed by 2016 to phase out $1 and $2 bills in favor of coins.
Design Features of US Dollar Notes
The design of US dollar notes, first standardized in 1928, features US presidents’ portraits on one side and historical illustrations on the other.
The $1 bill sparks the most intrigue due to its reverse side showing the Great Seal: 13 stripes on the eagle’s shield, an olive branch with 13 leaves and 13 arrows in its talons, 13 stars above the eagle, 13 steps on a truncated pyramid (representing the original 13 states), Roman numerals MDCCLXXVI for 1776 (Declaration of Independence year), the unfinished pyramid top with the All-Seeing Eye (ancient religious symbol), and Latin phrases like E pluribus unum (Out of many, one), Annuit Coeptis (He approves our undertakings), and Novus Ordo Seclorum (New Order of the Ages) from Virgil’s Aeneid, signaling a new American era. These Masonic symbols fuel public fascination.
Why Is the US Dollar Green?
The green color of the dollar stems from combating photography-based counterfeiting in the 1870s. Early black-and-white notes used minimal green edging, but as photography spread, authorities made green the dominant color using existing ink supplies.
Later versions added pink, yellow, and even orange hues, as in the 100-dollar note released on February 10, 2011, yet “greenback” remains the slang term.
Origin of “Buck” for US Dollar
The slang “buck” or “bucks” for dollars has multiple theories:
- From “buckskin,” deer pelts used in trade with Native Americans acting as currency.
- From “sawbuck,” resembling the Roman numeral X on the back of the $10 bill.
- A mythical link to Bacchus or Dionysus.
- Shortened from “greenbacks,” referring to the green-backed notes.
Security Features and Durability
As a prime target for counterfeiters, US dollar notes incorporate cutting-edge security tech, updated every 7-10 years while old versions remain valid until withdrawn.

Each note weighs about 1 gram, made from 25% linen and 75% cotton with synthetic fibers for longevity—it withstands around 4,000 folds before tearing. $100 bills last longest at 60 months on average; $1 bills wear out fastest in 22 months.
US Dollar Role in Forex Trading
On the Forex market, the dollar dominates as the key currency in all major pairs (majors). Post-gold standard, it became the benchmark for global currency values.
USD sees the highest daily trading volume regardless of US economic conditions and serves as the ultimate hedge currency, proven during financial crises.
FAQ
What controls US dollar issuance?
The Federal Reserve System acts as the central bank, overseeing banknote emission, while the Bureau of Engraving and Printing produces currency.
Why do USD notes feature Masonic symbols?
The $1 bill’s Great Seal includes 13-step pyramid, All-Seeing Eye, and Latin phrases symbolizing the 13 original states and a new era, linked to Masonic influences.
How durable are US dollar bills?
Each weighs 1g, made of linen-cotton blend; $100 lasts 60 months, $1 only 22 months, resisting 4,000 folds.



