Butō


 * is a bankai technique used by Gin Ichimaru's Zanpakutō, Kamishini no Yari.

Definition
By adopting a stance where he firmly grips Kamishini no Yari with both hands and places the Zanpakutō's hilt squarely to the center of his chest, Gin is able to unleash the tremendous extension and contraction properties of his Bankai to an even more terrifying extent than its normal state. This occurs in the form of a piercing maneuver where the extension and contraction of the blade becomes almost completely unseen to even the most-diligent of observers.