In mathematics, the tensor product, denoted by ⊗, may be applied in different contexts to vectors, matrices, tensors, vector spaces, algebras, topological vector spaces, and modules, among many other structures or objects. In each case the significance of the symbol is the same: the most general bilinear operation. In some contexts, this product is also referred to as outer product. The term "tensor product" is also used in relation to monoidal categories.
Read more about Tensor Product: Tensor Product of Vector Spaces, Tensor Product of Two Tensors, Relation With The Dual Space, Types of Tensors, Over More General Rings
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—Eric Gill (1882–1940)