Ultrawave

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Ultrawaves are a concept used in science fiction to represent transmissions or signals that may propagate faster than light through either normal space, or alternate space, such as hyperspace or subspace. Those that exist in hyperspace, may also be referred to as hyperwaves.

Though some pieces of sci-fi will use ultrawaves as a form of energy transmission or weapon, (beam weapon or death-ray).

• In E. E. Smith's Lensman series, ultrawaves propagate through the sub-ether superluminally, and were used for weapons, communications, and other applications, and had various frequencies.

• In Isaac Asimov's Foundation series, ultrawave and hyperwave are used interchageably to represent a superluminal communications medium.