Se Jong is named after the greatest Korean king Se Jong who invented the Korean alphabet in 1443, and was a noted meteorologist. The diagram represents the king, while the 24 movements refer to the 24 letters of the Korean alphabet.
So San is the pseudonym of the great monk Choi Hyong Ung (1520 to 1604) during the Yi dynasty. The 72 movements refer to his age when he organised a corps of monk soldiers with the assistance of his pupil Sa Myung Dang.