It was invented, not discovered.
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The sign of multiplication is x or *
Multiplication is invented by Human. Maths is not invention of single individual. Many Mathematicians around world discovered and invented new things and added them into Maths.
÷division sign (a.k.a. obelus)1659Johann Rahn×multiplication sign1618William Oughtred
Why algebra has a different multiplication sign is because they don't want to mix up the American multiplication sign with the variable x. So they use a centered dot for algebra instead of this: x.
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