The ridges on the edge of a U.S. quarter, known as “reeds,” are a historical security feature, not merely a decorative element. Their origin dates back to the 17th century, when a practice called “coin clipping” was a significant problem.

Thieves would shave small amounts of precious metal from the edges of coins. By accumulating the shavings, they could profit while still spending the now-devalued currency. This widespread fraud threatened the stability of economies.

A solution was introduced by Sir Isaac Newton during his tenure as Warden of the Royal Mint in 1696. He implemented reeded edges, which made any clipping immediately obvious. A shaved coin would show damaged or uneven ridges, revealing the tampering.

Even though modern dimes and quarters are no longer made of silver, the ridges persist. They continue to serve important functions, the first of which is security. The precise ridges are difficult for counterfeiters to replicate and are used by machines to authenticate coins.

Secondly, the ridges provide accessibility. The distinct tactile feel helps visually impaired individuals differentiate between coins, such as a smooth penny and a ridged dime.

Finally, the reeded edge maintains a tradition and consistency in the feel of money. The familiar texture and sound preserve a tangible connection to currency in an increasingly digital age.

Pennies and nickels remain smooth because they were never made of valuable metals targeted by clippers. Thus, the next time you handle a quarter, you are touching a centuries-old innovation designed for security, accessibility, and tradition.