Can anyone say what undelying is this?

I came across an option contract Nifty 20JUN 11700 PE what underlying is this? It is not the same as Nifty 20th JUN 11700 PE as the prices are so different. Is this an error or am I missing something? Nifty is definitely the index. But what is this?



There is a whole lot of different strikes too

It is June 2020 option contract

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Thanks for the clarification.