Japanese radiotelephony alphabet
The Japanese radiotelephony alphabet (和文通話表, wabuntsūwahyō; literally "Japanese character telecommunication chart") is a radiotelephony spelling alphabet, similar in purpose to the NATO/ICAO radiotelephony alphabet, but designed to communicate the Japanese kana syllables rather than Latin letters. The alphabet was sponsored by the now-defunct Ministry for Posts and Telecommunications.
Source: Wikipedia — Japanese radiotelephony alphabet (CC BY-SA 4.0)