$ETH "ETH" is short for "Ethereum", which is a digital cryptocurrency. "Currency pair" means exchanging one digital currency for another digital currency or fiat currency. So, "ETH with a currency pair" means any currency pair that includes the Ethereum currency.

Examples of common currency pairs including Ethereum:

ETH/BTC: exchanging Ethereum for Bitcoin.

ETH/USD: exchanging Ethereum for US dollars.

ETH/USDT: exchanging Ethereum for Tether (a stablecoin).

ETH/ADA: exchanging Ethereum for Cardano.

In other words, a currency pair can be any way to determine the value of Ethereum (ETH) against another digital currency or fiat currency.