The context you omitted explains what they meant by "largest known digit", but I guess you were trying to be funny?
> The largest known digit of Pi is 2, at position 202,112,290,000,000 (two hundred two trillion, one hundred twelve billion, two hundred ninety million).
> The largest known digit of Pi is 2, at position 202,112,290,000,000 (two hundred two trillion, one hundred twelve billion, two hundred ninety million).