** A secondary Hadamard transform performed on " DC " coefficients of the primary spatial transform applied to chroma DC coefficients ( and also luma in one special case ) to obtain even more compression in smooth regions.

** The Cartesian product of any family of nonempty sets is nonempty.

** König's theorem: Colloquially, the sum of a sequence of cardinals is strictly less than the product of a sequence of larger cardinals.

** Tychonoff's theorem stating that every product of compact topological spaces is compact.

** In the product topology, the closure of a product of subsets is equal to the product of the closures.

** Khoa, dairy product used in Indian cuisine

** Specification – specifying requirements of a design solution for a product ( product design specification ) or service.

** dot product,

** cross product,

** Kronecker product.

** Wedge product or exterior product

** Interior product

** Outer product

** Tensor product

** the Cartesian product of sets,

** the product of groups, and also the semidirect product, knit product and wreath product,

** the free product of groups

** the product of rings,

In mathematics, the Hadamard product may refer to:

* Hadamard product of matrices

For two matrices of the same dimensions, there is the Hadamard product, also known as the entrywise product and the Schur product.

For two matrices A and B of the same dimensions, the Hadamard product A ○ B is a matrix of the same dimensions, which has elements

Due to the characteristic entrywise procedure, this operation is identical to many multiplying ordinary numbers ( mn of them ) all at once-hence the Hadamard product is commutative, associative and distributive over addition, and is a principal submatrix of the Kronecker product.

It is also the sum of the entries of the Hadamard product.

Joint recurrence plots are the Hadamard product of the recurrence plots of the considered sub-systems ( Romano et al.

* J is the neutral element of the Hadamard product.