Kimberling numbers
In a triangle one can identify more remarkable points, called triangle center. On list of triangle centers you can find the best known. The Amerikaanse mathemetician Clark Kimberling indexed more than 10 000 points identified by their Kimberling number.
You can find this list online in the encyclopedia of triangle centers. For every point you can find its barycentric coordinates.
If you know the Kimberling number of one of this points, you can draw it directly in GeoGebra with the command TriangleCenter( Point , Point, Point, Nuber ) in which you can type the coordinates or the names of the verticles of a triangle and the Kimberling nummer of the point.
The point with Kimberling number n is written as X(n).