What is tau known for?

So, what exactly is tau known for in the world of mathematics and finance? Is it a revolutionary concept that's shaking up the foundations of our understanding, or is it more of a niche idea that only the most dedicated enthusiasts are familiar with? I'm intrigued to know what makes tau so special, and how it differs from other mathematical constants like pi. Can you give me a concise yet insightful overview of what tau is all about?