Bigfoot number is the biggest number to date. Bigfoot does surpass Tree (3) and Rayo's Number.
http://googology.wikia.com/wiki/BIG_FOOT
However, I think Tree (3) is the biggest number that appears in serious mathematics.
https://www.popularmechanics.com/scienc ... ber-tree3/
https://cs.nyu.edu/pipermail/fom/2006-March/010279.html
Bigfoot is the biggest finite number
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