I'm less interested in what a feature is, and more curious if there's some exhaustive list internally - or if there's even awareness of all of them spread throu

I'm less interested in what a feature is, and more curious if there's some exhaustive list internally - or if there's even awareness of all of them spread throughout the corporation. That is, in a large org like google (or msft, or...), how much stuff is there that no current employees are aware of? I work at a relatively small company for a number of years, and it's definitely been a challenge to maintain knowledge of feature creep that has occurred, let alone anything more in depth like what the features were _supposed_ to do.