A multiplication sign is the sign x which is put between two numbers to show that they are being multiplied.
multiplication sign in British English
noun
the symbol ×, placed between numbers to be multiplied, as in 3 × 4 × 5 = 60
multiplication sign in American English
noun
Math
the symbol (×), (⋅), or (*) between two mathematical expressions, denoting multiplication of the second expression by the first. In certain algebraic notations the sign is suppressed and multiplication is indicated by immediate juxtaposition or contiguity, as in ab