So I feel like there's piece of simple info that is probably just known and expected that we know if we're interested in starting an Alt, but sadly it's not lol
Basically in this tutorial it's optional to rename BTC or bitcoin, so I guess the question is; is the symbol or name not actually assigned in the code it self? Obviously in a wallet you can label it what ever you want and that asset has an address and network where you interact with it, and exchanges likewise are running nodes and in their displays can label blockchain "X" as what ever they want when it's displayed.
So is the public key and/or network identifier the actual identifier for the coin and the coin name/symbol not actually dictated by the code?