Swirlee

Wikipedia: Feynman point The Feynman point comprises the 762nd through 767th decimal places of π, consisting of the digit 9 repeated six times. … The name refers to a remark made by the physicist Richard Feynman, expressing a wish to memorise the digits of π as far as that point so that when reciting them, he would be able to end with ‘… nine, nine, nine, nine, nine, nine, and so on.’

Also: Do NOT convert pi to binary.

Witch of Agnesi A fun curve (the geometrical kind) with a fun name. If we told kids they could have witches named after them, our colleges might have more math majors.

has_and_belongs_to_none There are geek shirts, and then there are geek shirts. If not for the fact that nobody outside a Ruby on Rails conference would get it, I would declare :"ceci n'est pas un string" and validates_presence_of :bling instant classics. (via RedHanded)