This is the legendary martial art discipline which Jean Claude Van Damme refers to in his film "blood sport".
Literally translated from Chinese it means "death touch" or deadly touch and refers to the discipline which was developed in the 13th century AD by the Shaolin monk and acupuncture master Chang San Feng and was called H'ao Ch'uan.
Chang San Feng used his knowledge of acupuncture to investigate whether he therewith also could turn off potential opponents.
Because with seemingly little effort he was able in this way to kill people, it got the name Dim Mak. Chang San Feng hid his techniques and point combinations in a form that would later become the basics of Tai Chi Ch'uan.
Throughout history, it would eventually affect all forms of martial arts. All be it more as a supplement that makes more effective and efficient the techniques of those disciplines.
What, however, often is forgotten is that it is not so much the Dim Mak points or the point combinations that are important, but the way we activate them. Notably through the H'ao Ch'uan or loose boxing way which, indicates the use of Fa Jing, a special form of Qi Gong which one learns to generate explosive kinetic energy and transfer it in the body of the opponent.