[boost] What does "ll" stand for?

This is for the "ll" function defined for quaternions and octonions. The function returns the 1-norm of its argument. Does anyone know what the "ll" name stands for? I finally figured out that "sup" (the infinity-norm) most likely stands for "supremum". (BTW, "abs" is the 2-norm. The "norm" function isn't actually in this system, despite the name!) -- Daryle Walker Mac, Internet, and Video Game Junkie darylew AT hotmail DOT com