Pseudovector

Physical quantity that changes sign with improper rotation

In physics and mathematics, a pseudovector is a quantity that behaves like a vector in many situations, but its direction does not conform when the object is rigidly transformed by rotation, translation, reflection, etc. This can also happen when the orientation of the space is changed. For example, the angular momentum is a pseudovector because it is often described as a vector, but by just changing the position of reference, angular momentum can reverse direction, which is not supposed to happen with true vectors.

This keyword could refer to multiple things. Here are some suggestions: