Could you please clarify what PIB stands for within the context of the Pi network? I'm curious to know if it refers to a specific type of token, currency, or perhaps a feature of the platform that I'm not familiar with. As an investor and enthusiast in the world of cryptocurrency and finance, I'm always eager to stay informed about the latest developments and innovations in this rapidly evolving space. Could you elaborate on the significance and purpose of PIB within the Pi network?