This is the name of the option contract. 50etf refers to the underlying price of the option. "Sell" refers to the option being a put option. "April" refers to the expiration date of the option being the fourth Wednesday of April. 2,400 refers to the price of the option.

The exercise price is 2.4 yuan.

The buyer of this contract has the right to sell 50 ETFs at a price of 2.4 yuan per share when the option expires.