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x is a-cross
y=1 does not cross the x-axis. It is a line parallel to the x-axis (and therefore can't ever cross it)
The x and y axis cross at (0,0) on the coordinate plane.
Multiplication signs probably. They can be represented by an "x". Plus signs also look like a cross, and are more horizontal "+".
It is the cross product of two vectors. The cross product of two vectors is always a pseudo-vector. This is related to the fact that A x B is not the same as B x A: in the case of the cross product, A x B = - (B x A).