Here are a few examples of laser-cut stainless steel lettering designs:

These designs are created using my own true-type fonts. I make a design and layout which I then convert to a path. This is a vector outline that can then be edited. This looks a bit like this:

These designs can then be scaled and laser-cut at any size. As you can see from the “may the circle be unbroken” design, I have made these at 30cm diameter and up to 1200mm diameter on the barn.