What are the symbols used in Binance's dapi (coin futures api)?

I am trying to download historical price data of BTC/USD perpetual futures using binance's api for coin futures, specifically, I'd like to use this endpoint. However, I cannot find what 'symbol' I have to specify for BTC/USD. I've tried multiple variations to no avail (such as BTCUSD, BTCUSD_perpetual, etc. I constantly get the error: "Invalid symbol."

If anyone is interested, I found out that you can get a list of all symbols using: GET /dapi/v1/exchangeInfo. The BTC/USD perpetual futures one is: BTCUSD_PERP.