The Gemini I know is “an application-layer internet communication protocol for accessing remote documents, similar to HTTP (Hypertext Transfer Protocol) and Gopher”. It’s not used much but it could be a useful alternative to the, now Google controlled, internet. Maybe Google named their project Gemini to obfuscate a potential competitor for simple web pages (or perhaps both project teams are bad at choosing names - if Gemini isn’t a human cloning machine you’re doing it wrong).