One Piece Encyclopedia

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Impel Down	It is an underground prision located in the governmental island, Enies Lobby. Here it is where the most dangerous criminals of the world are sent.
Isshi-20	When Wapol exiled all the doctors from Drum, he choose a group of selected doctors for his personal use, that group is called the "Isshi-20". All citizen who needed be taken care of doctor must go to Wapol and suplicate that they cure him.
Ittou Ryuu	Ittou Ryuu is a sword discipline that consists in using only one sword.
Ittouhei	"First class private recruit" - A person recruited by marines to exert as soldier.