Swizzling is the act of reordering the components of a vector.
This is common in changing coordinate systems, where the Z axis becomes the Y axis.
This node will allow you to both swizzle the components, and also flip individual components.
If you're going from Y up to Z up you want to swizzle Y and Z and Flip the X to -X
Positional values to be changed.
Swizzel all the possible XYZ combinations.
Inverse any of the possible XYZ combinations.
For reversing the negations.