converging-point
131Nuclear weapon design — The first nuclear weapons, though large, cumbersome and inefficient, provided the basic design building blocks of all future weapons. Here the Gadget device is prepared for the first nuclear test: Trinity. Nuclear weapon designs are physical,… …
132Quadripoint — In geography, a quadripoint is a point on the Earth that touches four distinct regions. Such points are often called four corners , from the corners of the four regions meeting there. [One could argue that, if one region lies on one side of a… …
