https://www.raygunsite.com/products/515-logo-mini-sticker
Certainly looks like there is a "R" at bottom.
In that example, it looks more like the "R" is denoting a Raygun watermark. The "R" that means something is usually in a circle, denoting a registered trademark.
Even if that actually was a signal for registered trademark, what does Raygun own? Do they have to be paid every time the outline of Iowa is printed? If I call my parents in the 515, do I owe them money?