Crypto exchange – what do BTCUSD SELL and LTCBTC SELL mean?

I just downloaded an app that forecasts the crypto market. The app seems to be nice but I don’t understand the forecast interface. What does this mean?

BTCUSD SELL,  
LTCBTC SELL 

Does it mean that I can sell my bitcoin to someone that has dollars?

For the second, does it also mean that I can sell my LTC to someone that has BTC that is invariably buying BTC with LTC?

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