What are these BANK Nifty CE and PE Indexes

If someone can just explain me what the numbers between the Month and CE/PE mean ? And why are there so many of them ? And why only some of them are active ?

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Those are the weekly expiry dates for the weekly Nifty options.

I think I framed my question a bit wrong. I need some help in analysing strike prices.

https://www1.nseindia.com/live_market/dynaContent/live_watch/option_chain/optionKeys.jsp?segmentLink=17&instrument=OPTIDX&symbol=BANKNIFTY&date=9JAN2020

I think I’ve figured it out by now.

Not the weekly expiry, I meant the different strike prices and analysing them.