Pseudotensor

A pseudotensor is a mathematical object similar to a tensor, but it behaves differently under transformations, specifically under improper transformations such as reflections or parity transformations. While a regular tensor (like a vector or a second-order tensor) transforms according to certain rules under coordinate changes, a pseudotensor will change its sign under these transformations. To be more specific, pseudotensors come into play in various areas of physics, especially in the context of fields such as general relativity and continuum mechanics.