What is rune used for?

Could you please elaborate on the purpose and usage of rune in the realm of cryptocurrency and finance? I'm quite curious to know about its specific applications and the value it brings to the industry. Could you provide an insight into how rune is being utilized currently, and perhaps also share some potential future scenarios where it might play a pivotal role? I'm eager to understand the significance of rune and how it fits into the larger picture of cryptocurrency and finance.