Internal Knot

One of the knots $t_{p+1}$, ..., $t_{m-p-1}$ of a B-Spline with control points ${\bf P}_0$, ..., ${\bf P}_n$ and Knot Vector

$${\bf T}=\{t_0, t_1, \ldots, t_m\},$$

where

$$p\equiv m-n-1.$$

See also B-Spline, Knot Vector