Konsō

is a technique used by Shinigami as a fundamental part of their roles in maintaining the cycle of souls between the Human World and Soul Society.

Overview
Konsō is the process by which Shinigami send Pluses to Soul Society from the Human World, which is known as "crossing over". To achieve this, they tap the hilt of their Zanpakutō against a Plus's forehead, leaving an emblem at the point of impact which begins to shine brightly. The Plus proceeds to sink into the ground in a pool of blue light as they are sent to Soul Society, and a Jigokuchō flies away from their point of departure. However, if the Shinigami presses the hilt against the Plus's forehead too hard, the Plus is left in pain during the process.

Appearances in Other Media
In Bleach: Memories of Nobody, the process of Konsō is depicted slightly differently; rather than sinking into a pool of blue light, Pluses sent to Soul Society turn into a small orb of light that ascends into the sky.