What is meaning of PCR in futures?

I am able to understand PCR OI for Options (for specific strike price or whole stock or indices).

But how to interpret PCR for futures of a stock or index?
Can someone please explain this concept or send me link to reference material that explains this?

don’t think futures have pcr… pcr is calculated taking open interest of puts and calls in consideration… puts and calls are present in options not futures so there will be no pcr for futures.