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The sign of multiplication is x or *
you can use a star for example 8*9=72 or you can use upper case X as the variable and lower case x as the multiplication sign, for example X x Y=XY
Well, you can simply go: x or you can do shift+8 which is * which will also be acceptable.
÷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.