see Index of Refraction. Jitter: refers to random jostling of things. When applied to area lights is causes the lights to be shaken up a bit to prevent shadow bands from forming. With anti-aliasing, it bumps the extra rays around a bit, which breaks up edges. ( Language Reference) ( Command Line Reference) Kumquat: an orange-like fruit with an edible rind and a bitter pulp. Note that the only connection with POV-Ray is that it puts something in the "K" section. See eggplant. Leopard pigment which consists of regularly spaced spots of color, like a leopard's coat. Well, it would have to be a very geometric leopard, but that's the basic idea. ( Language Reference)