Order of the Phoenix (fictional organisation) name, Lupin, refers to the Latin word "lupus", which means wolf. Alastor "Mad-Eye" Moody is perhaps the most famous Auror in the modern times of the Wizarding World, single-handedly responsible for capturing numerous wizard criminals. He is also said never to have killed his quarry, even when permitted to do so, unless he had no other choice. Moody's face is badly scarred; he has lost several body parts while fighting Dark wizards, including his left eye, lower left leg, and part of his nose; and he is cautious – some characters might say paranoid – in that he refuses to
Kac–Moody algebra important subclass of Kac–Moody algebras corresponds to "symmetrizable" generalized Cartan matrices "C", which can be decomposed as "DS", where "D" is a diagonal matrix with positive integer entries and "S" is a symmetric matrix. Under the assumptions that "C" is symmetrizable and indecomposable, the Kac–Moody algebras are divided into three classes: Symmetrizable indecomposable generalized Cartan matrices of finite and affine type have been completely classified. They correspond to Dynkin diagrams and affine Dynkin diagrams. Little is known about the Kac–Moody algebras of indefinite type, although the groups corresponding to these Kac–Moody algebras were constructed over arbitrary fields by Jacques Tits.