<mathematics, programming> An expression in mathematics or computer
programming consisting of two other expressions multiplied together. In
mathematics, multiplication is usually represented by juxtaposition, e.g. "x y",
whereas in programming, "*" is used as an infix operator, e.g. "salary *
In the most common type of product, each operand is a number (integer, real
number, fraction or imaginary number) but the term extends naturally to cover
more complex operations like multiplying a string by an integer (e.g., in Perl,
"foo" x 2) or multiplying vectors and matrices or more than two operands.
In type systems, a tuple is sometimes known as a "product type".
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