"Jyian" originally means a boss character in a Japanese cartoon "Doraemon", who decides everything (often forcibly:-)) in the Doraemon world. This is also a nickname of kazu-san, the leader of KAME Project, because of his neat leadership:-).
c.f.) There seems to be no official word to denote "Jyian" in English. Here I choose "Jyian", because it seems like the de-facto word according to google.