What is RSR Reserve Rights?

Could you elaborate on what RSR Reserve Rights is? I've heard it mentioned in relation to cryptocurrencies and finance, but I'm not entirely sure of its function and purpose. As a professional in this field, I'm curious to know if RSR is a token, a platform, or a service, and how it fits into the broader cryptocurrency ecosystem. Additionally, I'd like to understand the potential use cases for RSR and its role in promoting stability and efficiency in the financial markets. Could you provide a concise yet comprehensive description of RSR Reserve Rights?