CL is the contract code, and the second letter indicates the delivery month.

F:65438+ October G: February H: March J: April

K: May M: June N: July Q: August

U: September V:65438+ October X: 165438+ October Z:65438+ February.

The last number represents the delivery year, 5 represents 20 15, and 6 represents 20 16 (ranger stock market data).