$BTC

Here are some popular BTC pairs:

- *BTC/USDT*: Bitcoin paired with Tether USD, a stablecoin pegged to the US dollar.

- *BTC/ETH*: Bitcoin paired with Ethereum, another widely traded cryptocurrency.

- *BTC/LTC*: Bitcoin paired with Litecoin, a peer-to-peer cryptocurrency.

- *BTC/BCH*: Bitcoin paired with Bitcoin Cash, a fork of the Bitcoin blockchain.

When trading BTC pairs, it's essential to understand the base currency and quote currency. The base currency is the first currency in the pair, while the quote currency is the second.

For example, in the BTC/USDT pair, Bitcoin is the base currency, and Tether USD is the quote currency. This means that the price of the pair represents the amount of USDT needed to buy one Bitcoin.

You can find more BTC pairs on cryptocurrency exchanges like Binance, Coinbase, or Kraken. Always research the exchange and the pair before making any trades.