An asterisk, not to be confused with Asterix who is a cartoon character, is used to denote multiplication (or times) ie a*b = a times b. Some old programming languages/computers used double asterisks to denote exponentiation ie a**b = ab.
This was because x was often used to denote a variable and its use to denote multiplication could cause confusion.
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What does length mean in math
Communitive means of, or belonging to, a community. It has no meaning in math. Communative does not mean anything - in math or elsewhere.
What does > mean?
the mean is the average
The word "mean" in math means the same thing as average. Mean is just a nickname for average.