What is a polis coin?

As a keen observer of the cryptocurrency landscape, I'm curious to know more about the so-called "polis coin". Could you please elaborate on what it is, its origins, and the potential use cases it aims to serve? I've heard whispers about its potential in decentralized governance, but I'd like a more comprehensive understanding of its functionality, technology, and any challenges it may face in the competitive crypto market. Additionally, I'm interested in its tokenomics, including its issuance mechanism, distribution, and potential for appreciation. Thank you for your insights!