What Is The Edge Of A Coin?

By GovMint :

In the realm of numismatics, the edge of a coin refers to the outer surface of a coin alongside the obverse (front) and reverse (back). The edge plays a crucial role in coin design and security features. Depending on the issuing mint's preferences, it can be plain, reeded, lettered, or decorated with various designs. Beyond aesthetics, the edge serves practical purposes, such as preventing counterfeiting and adding a layer of complexity to coin production. This often-overlooked part of a coin contributes significantly to its overall appearance and security.

Sources Used:

https://www.usmint.gov/learn/kids/coins-life/parts-of-a-coin