Not available? Well, dammit. I must've linked wrong. I'll try to fix it.

It occurred to me recently that the last bit of the LRR logo is a shape that is somewhat compatible with the Greek Δ. A while later, I had made this. I was a bit surprised, to be honest, but there you go. https://lh3.googleusercontent.com/oj8FZ1v8PQvDATu9BcURMU9xio54AXesa8w0JoMeYyW-7CwRVn7RaNPSnzv8R...