A scalar which reverses sign under inversion is called a pseudoscalar. For example, the scalar triple product is a pseudoscalar since
Pseudoscalar
See also
Pseudotensor, Pseudovector, ScalarExplore with Wolfram|Alpha
References
Arfken, G. Mathematical Methods for Physicists, 3rd ed. Orlando, FL: Academic Press, p. 131, 1985.Referenced on Wolfram|Alpha
PseudoscalarCite this as:
Weisstein, Eric W. "Pseudoscalar." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Pseudoscalar.html