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A small circle between two matrices, multiplying them entry by entry.
Also known as: Elementwise product, Schur product, Entrywise product, Hadamard product
The Hadamard product is what most people assume matrix multiplication is: multiply matching entries. It needs its own symbol precisely because the ordinary product is not that, and the two require different shapes — Hadamard needs identical dimensions, ordinary multiplication needs matching inner dimensions.
Denotes elementwise multiplication of two matrices of identical dimensions.
Contexts: Mathematics
Requires the two matrices to have exactly the same shape, unlike the ordinary matrix product; the result has that shape too.
Contexts: Mathematics
Is the operation numerical libraries expose as the plain multiplication operator on arrays, which is a frequent source of confusion when moving between mathematics and code.
Contexts: Mathematics
A small open circle set between two matrix names at mid-height, smaller than a letter O.