Here are three notable coins:

Bitcoin (BTC): The first and most well-known cryptocurrency, primarily used as a store of value and medium of exchange.

Ethereum (ETH): A blockchain platform that enables smart contracts and decentralized applications (DApps), with Ether being the native cryptocurrency.

TON (TON): The native cryptocurrency of The Open Network (TON), used for transaction fees, staking, and governance within the TON blockchain ecosystem.

Let me know if you'd like more information about any of these!