DSS Choker

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A 3D wire-frame of the DSS choker device, showing Hex Glyphs and the meaning of the anagram

The choker attached to Shinji's neck

The DSS Choker (DSSチョーカー) is a device installed by Wille around Shinji's neck after his recovery from Eva-01. It is designed to explode and kill the wearer, and is intended to be used in the event that the wearer becomes a trigger for an Impact. DSS stands for Deification Shutdown System.

Misato carries the detonator for Shinji's collar. When Shinji escapes from Wille with Eva-09, despite being urged to use it by Ritsuko, Misato hesitates and is unable to kill Shinji after the collar passes out of range.

At Nerv HQ, Kaworu is somehow able to safely remove the device from Shinji's neck and places it on his own instead. During the Fourth Impact, the device detonates and Kaworu is killed.

The collar appears to be more than a simple bomb. As Kaworu's device activates, symbols begin lighting up and holographic prisms being circling his neck.