The Sannin (伝説の三忍, Densetsu no Sannin; Literally meaning "Legendary Three Ninja") is the title given to the members of Team Sarutobi, namely Jiraiya, Orochimaru, and Tsunade. The title was received after their battle with "Salamander" Hanzo of the Village Hidden in Rain, who after a long and intense fight which resulted in their loss, declared that he was impressed and would let them live if they would take on new titles as the Sannin of Konoha. The Sannin are widely regarded for their great skill and power, each one the level of a Kage in their own right. Their name is known in countries all across the world. Tsunade is the only surviving Sannin, Jiraiya and Orochimaru having been killed by Pain and Sasuke/Itachi respectively
There will be no more Sannin =)