Huh. I never heard it called that before. My background is in math so I always though of it in terms of the sign function: http://en.wikipedia.org/wiki/Sign_f

Huh. I never heard it called that before. My background is in math so I always though of it in terms of the sign function: http://en.wikipedia.org/wiki/Sign_function http://en.wikipedia.org/wiki/Sign_function spaceship(x,y) = sign(x-y), for numbers, anyhow.