DVD by Bullet For My Valentine Other uses Nuclear poison, a neutron-absorbent material that impedes an intended nuclear reaction Poison (perfume), by Christian Dior Poison (game), a children's game In software engineering, a poison is a special value given to uninitialized or freed memory; reading this memory provides only dummy data (however identifiable) or may cause the software to voluntarily be trapped (e.g. pointer to nowhere). This is employed as a security mechanism against attacks and a way to detect software failures. See also Poisson (disambiguation)