Answer:
Centroid
Step-by-step explanation:
The center of gravity of any object is a point in the object where the weight of the object is distributed uniformly and at which the body is able to maintain its balance.
Centroid is the point which represents the mean position of all the points on the object. When we cut a plane shape from a bit of card it adjusts consummately on its centroid.
In case of triangle, the centroid is the point where all the three medians of the triangle intersects.
Thus in the Ty's model the centroid represents the center of gravity.