Curve of centers of curvature

Curve of centers of curvature

I really can't find the English name of the curve of the centers of
curvature of a curve. Formulated more precisely: Suppose $\alpha$ is a
regular curve in $\mathbb{E}^2$ and $||\alpha(t)'||=1$. How do you call
$\gamma(t) = \alpha(t)+ \frac{1}{\kappa(t)}N(s)$ in English? I'm following
a geometry course in dutch and there this curve is called "centrale
kromme" (literal translation: central curve) or "evoluut" in case this
would ring any bells...
Thanks!