$BTC

The most common BTC currency pairs include:

1. *BTC/USD*: Bitcoin against the US Dollar.

2. *BTC/BRL*: Bitcoin against the Brazilian Real.

3. *BTC/EUR*: Bitcoin against the Euro.

4. *BTC/GBP*: Bitcoin against the British Pound.

5. *BTC/JPY*: Bitcoin against the Japanese Yen.

Additionally, there are also cryptocurrency pairs, such as:

1. *BTC/ETH*: Bitcoin against Ethereum.

2. *BTC/LTC*: Bitcoin against Litecoin.

3. *BTC/BCH*: Bitcoin against Bitcoin Cash.

These pairs allow traders to buy and sell Bitcoin against other currencies or cryptocurrencies.