What was the August 1945 radio address announcing Japan’s acceptance of Allied terms called?

The August 1945 radio address was called the Jewel Voice Broadcast.

The name refers to the Gyokuon-hōsō, the recorded speech in which Emperor Hirohito announced Japan’s acceptance of the Potsdam Declaration. It aired nationwide at noon on August 15, 1945. The Japanese title uses a traditional expression describing the emperor’s voice as precious or jewel-like; the English translation became widely familiar later.

The address was recorded on August 14 at the Imperial Palace. Two phonograph records were produced, because senior officials feared that opponents of surrender might seize or destroy the recording. During the night, officers associated with the attempted palace coup searched for the records and tried to stop the broadcast, but palace staff concealed the discs and transported them safely to the radio station.

Many listeners did not immediately recognize the speech as a direct surrender announcement. Hirohito used highly formal language and referred to acceptance of the Allied declaration rather than plainly saying that Japan had capitulated. The broadcast marked the public announcement of Japan’s decision; the legal and ceremonial surrender occurred aboard USS Missouri on September 2.