The blood group whose red cells carry neither the A nor B antigens

In mathematics, the orthogonal group in dimension n {\displaystyle n}, denoted O ⁡ {\displaystyle \operatorname {O} }, is the group of distance-preserving transformations of a Euclidean space of dimension n {\displaystyle n} that preserve a fixed point, where the group operation is given by composing transformations.

Group O, headquartered in Milan, Illinois, is one of the largest Hispanic-owned companies in the U.S. and a provider of managed products and services.