Crest of Knowledge
The Crest of Knowledge (知識の紋章, Chishiki no Monshou) is one of the nine Crests. It is engraved with a pattern constituting a pair of concentric circles joined by an arch, vaguely reminiscent of binoculars.
The Crest of Knowledge was located in DA18, found by Izumi Koushiro and Ishida Yamato in a well near Piccolomon's home along with the Crest of Friendship. It was first activated in DA26 while Koushiro and the depleted Bubbmon attempted to escape from the clutches of Vademon; it enabled Bubbmon to quickly evolve back into Kabuterimon before enabling him to super-evolve to Atlur Kabuterimon for the first time. Its physical form was later destroyed by Apocalymon, and in May 2000 Koushiro surrendered its power to free one of the Four Holy Beasts from the bonds placed upon them by the Dark Masters.
Digimon inscribed with this Crest