how can the x be distinguished between a multiplication sign and the meaning that stands for cross? example AxB, could it mean (A times B) and A cross B.
The meaning will be clear from the context of the situation.
Multiplication is defined for numbers, not for sets. So if A and B are numbers, then A x B would be the product of A and B.
However if A and B are sets, then A x B means the cross product of A and B.