Premium reflective of the November 2021 (X) futures contract. As might be guessed by the high levels and spreads, both curves are currently backwardated.
Brent is at almost 72 dollars a barrel and WTI is just under 68.5 dollars a barrel.
WTI October (V) is still trading; at a slight premium (24 cents) to November (X).
For a quick recap of month codes check out the CME Group's contract code table.