Unichain is a Ethereum Layer 2 network built on the Superchain.
Unichain is intended to be a faster and cheaper L2, built to be the home of DeFi and liquidity across chains.
The Unichain mainnet uses Unichain ETH as the native token.
The Unichain testnet uses Unichain Sepolia ETH as the native token.
Learn more about Unchain in this blog post: Unichain – an Ethereum L2 designed for DeFi.