Ansible

The term ansible refers to a category of fictional technological devices capable of superluminal or faster-than-light (FTL) communication. These devices can instantaneously transmit and receive communicative and informational data streams across vast distances and obstacles, including between star systems and even across galaxies. As a name for such a device, the term ansible first appeared in a 1966 novel by Ursula K. Le Guin. Since that time, the broad use of the term has continued in the works of numerous science-fiction authors, across a variety of settings and continuities. Related terms are ultraphone and ultrawave.

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