What was the name of the Japanese surrender document signed aboard USS Missouri?

The document signed aboard USS Missouri was the Japanese Instrument of Surrender.

The instrument formalized Japan’s capitulation and ended hostilities in World War II. It was signed in Tokyo Bay on September 2, 1945, by Japanese representatives and Allied representatives from nine nations. General Douglas MacArthur signed for the Allied powers, while Mamoru Shigemitsu and Yoshijirō Umezu signed for Japan.

The document is different from the Potsdam Declaration, which was the Allied statement of surrender terms issued in July 1945. Japan’s August announcement accepted those terms, but the Instrument of Surrender was the legal document that recorded the formal capitulation.

Two versions were prepared: an Allied copy and a Japanese copy. A signing mistake by Canadian representative Lawrence Moore Cosgrave caused the printed national labels to be misaligned on one version. Richard K. Sutherland corrected the labels by hand, creating one of the document’s best-known physical details.