Shinigami Eyes, Death Note Wiki

Shinigami Eyes (死神の目, shinigami no me), also known as Shinigami Eyeballs or Eyes of the Shinigami, are eyes bestowed by Shinigami per a deal. They allow the user to see both the names and lifespans of humans floating above their heads. A person's eyes look no different after they gain the Shinigami Eyes. It is impossible for humans to tell (scientifically or otherwise) who possesses Shinigami Eyes. In the manga and other adaptations, the eyes are sometimes depicted artistically for the reader/vi

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Shinigami, Death Note Wiki

So, in death note's rule it says 'shinigami musn't tell humans the names and or life span od individuals he sees. this is to avoid confusion in the human world' What is

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