These six 9s are the Feynman point, that begins at the 762nd decimal place of the decimal representation of π.
It is named after physicist Richard Feynman, who once stated during a lecture he would like to memorize the digits of π until that point, so he could recite them and quip "nine nine nine nine nine nine and so on", suggesting, in a tongue-in-cheek manner, that π is rational.
(from: Wikipedia)
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