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consecutive visiting days for 100 days will reward a gold badge.
Just to make sure that: consecutive visiting days for $x$ days, more than 100 days, say will some $x>100$, there is another badge on the $x$th day?
There is no such badge as of now.
(It is conceivable, but seems highly unlikely, that such a badge might be created in the future and applied retroactively.)
Related threads here and on metaSE.