e, which is the reciprocal of the square root of e to the pith power.

Now thou hast unwished five thousand men.

He might, said Bacon, though I have small fear of his doubting the supernature of the android. He is much given to superstition, and his strange dream will confirm that bent of mind.

1609 (revised 1625), Francis Bacon, De Sapientia Veterum ('Wisdom of the Ancients')