Hello, I'm new to coin collecting so please be patient with me. I have a 2015 penny with the letter J after the word trust. I'm just wondering what type of error coin this is so I can try and research a bit further . Thanks!
Looks like a J but it's not. Some anomaly on the Copper Plating. Paredolia. Not a Mint Error of any kind.
Welcome to CT @Tigerlady. That does clearly look like the letter J after TRUST, but as @paddyman98 stated, it isn't. During the year 1982, the U.S. Mint switched from minting cents on copper to a copper plated zinc metal (https://www.pennymatrix.com/2019/05/what-year-did-penny-change-from-copper.html) and that thin layer of copper on the coin causes all sorts of problems and anomalies. Pareidolia is the human mind wanting to see something that isn't really there, sort of like looking at clouds and seeing animals. We all do it so it's just human nature, but your coin is the clearest example of it I've seen. In studying the minting process, you can see that it would be almost impossible for that to be an actual letter. It's too small and nothing like the type letters used in producing the cent design, but keep on looking and have fun. Feel free to post and ask question like you have here. Good luck.