What nickname is commonly given to Emperor Hirohito's 1945 surrender broadcast?

Emperor Hirohito's 1945 surrender broadcast is commonly called the Jewel Voice Broadcast.

The Japanese name is Gyokuon-hōsō, a term referring to the emperor's voice. The broadcast was historically remarkable because it was the first known time that ordinary Japanese people heard the voice of their emperor. Before this event, imperial communications were generally mediated through officials and written announcements.

The speech was recorded on August 14, 1945, rather than transmitted live. Technicians from NHK recorded Hirohito at the Imperial Palace while political leaders debated the wording. The official recording was secretly protected during an attempted military coup intended to prevent the announcement.

At noon on August 15, the recording was played nationwide. Its formal language, unfamiliar pronunciation, and poor audio quality made the message hard to follow. The emperor also avoided saying plainly that Japan had surrendered, so an announcer explained the meaning afterward.