What Does FS Mean in Coins?

By GovMint :

In the numismatic world, "FS" can stand for two different things depending on the context. "FS" refers to "Full Steps," a designation used for Jefferson Nickels that indicates the coin has fully defined steps on Monticello, a sign of a well-struck coin. However, the abbreviation "FS" can also mean "First Strike," a term used by the Professional Coin Grading Service (PCGS) to denote coins that were struck within the first 30 days of a new issue's release.

Sources Used:

https://www.linkedin.com/posts/pcgs_what-does-fs-mean-on-a-pcgs-label-activity-7037194734171295744-8z2b