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"[Science fiction] has become big business, where books are merchandised and promoted and distributed and placed on sale like slabs of bacon or cans of soup."
- 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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