Holor
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A holor is a mathematical entity that is made up of one or more independent quantities, and includes complex numbers, scalars, vectors, matrices, tensors, quaternions, and other hypercomplex numbers. A holor is a generalized tensor; multiplying holors (tensor products) is done without regard to direction.
There is only one book on this topic. (See external link below.)
[edit] Reference
Parry Moon and Domina Eberle Spencer: Theory of holors : a generalization of tensors Cambridge University Press, 1986