The Shingon Buddhist School (真言 宗, Shingon-shū) is one of the major currents of Buddhism in Japan. Shingon is the Japanese reading of the Chinese word 真言, translation of the Sanskrit word mantra (incantations). 真 means truth and 言 word.
There are many branches of this sect founded by the monk Kukai in the ninth century.
Most of the temples along the Henro Michi (pilgrimage of the 88 temples at Shikoku in Japan) are part of this current. It is one of the oldest branches of Vajrayana Buddhism or Tantric Buddhism.