What are the circled numbers in review mode?

I couldn’t find any info about them here or in the docs. What do they mean? What are they for?
I refer to the ones to the right in this pic:


Sorry for the late reply.

For the '1(23)' alike format, the first number n means the n-th document that this card is in, and the second number just indicates the pages.

Kind Regards,
Support Team

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