Tsūshōgō (通称号) were unit code names used by the Imperial Japanese Army (IJA) during World War II.
Unit Character Codes typically consisted of one character, although some units established in the late stages of the war had two-character codes.
Unmobilized units were assigned area codes, such as "east" (東部, tōbu) for those units under the jurisdiction of the Eastern District Army.
For example, the 116th Division was assigned Arashi (嵐, "storm") as its Unit Character Code.
Officially named the Epidemic Prevention and Water Purification Department for the Kwantung Army (関東軍防疫給水部本部), the unit was assigned the code name Manshū 731.