"dot dot dot" is an ellipsis. It means that the number continues in the way shown to infinity. For instance, the decimal 0.33333... which results from 1/3 carries on giving 3s forever. This cannot be written, obviously, so you write the ellipsis instead. This is also true if a pattern is more than just one number, 23/99 gives the decimal 0.232323.... where the dots represent how the 2323 pattern continues forever.
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multiplication
It's called an Interpunct.
A vector rotation in math is done on a coordinate plane.2D vectors can be rotated using the cross and dot product.3D vectors are rotated using matrix based quaternion math.
HL in math mean hypotenuse leg
The dot-product and cross-product are used in high order physics and math when dealing with matrices or, for example, the properties of an electron (spin, orbit, etc.).