Correction, tokens are a representation of a particular asset or utility, that usually resides on top of another blockchain.

BTA is the trading symbol of Bata, which has it's own blockchain. Usually referred to as an altcoin. Altcoin - an alternative to Bitcoin. The majority of altcoins are a variant (fork) of Bitcoin, built using Bitcoin’s open-sourced, original protocol with changes to its underlying codes, therefore conceiving an entirely new coin with a different set of features.