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"Does it open a new horizon for my thinking? Does it lead me to think new kinds of thoughts, that I would not otherwise perhaps have thought at all? These qualities are what [make] science fiction ...unique."
- Frederik Pohl

Hypertracer  
  A device that allows a pursuer to follow a spaceship through hyperspace.  

"What is it?"

"A hypertracer."

"That's not enough. I'm not a foundation man. What is it?"

"It's a device to allow the ship to be traced through hyperspace."

"In other words we can be followed anywhere."

"Yes sir."

From Second Foundation, by Isaac Asimov.
Published by Doubleday in 1953
Additional resources -

Compare to the tracer-bird from Changeling (1980) by Roger Zelazny.

Also, recall the homing beacon from the original Star Wars movie.

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  More Ideas and Technology from Second Foundation
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