three-pronged vajra thrown by Kūkai to determine the site for Esoteric Buddhism's holy land
A specific Buddhist term referring to the ritual object Kūkai (Kōbō Daishi) is said to have thrown upon his return from China; it landed at Mount Kōya, marking the location for his monastery.
It is said that when Kūkai returned from Tang China, he threw the flying three-pronged vajra.
The flying three-pronged vajra is said to have landed on Mount Kōya, which then became the holy land of Shingon Esoteric Buddhism.
A general term for a three-pronged vajra (ritual implement) used in Esoteric Buddhism, while 飛行の三鈷 specifically refers to the one associated with Kūkai's legend.
Mount Kōya, the location where the vajra is said to have landed and the center of Shingon Buddhism founded by Kūkai.
From 飛行 (flying) + の (possessive particle) + 三鈷 (three-pronged vajra). The term originates from the legend of Kūkai (Kōbō Daishi) throwing a vajra to choose the site for his monastery.