Tractor beam emitter
From Memory Alpha, the free Star Trek reference.
A tractor beam emitter is a starship component that projects a graviton beam called a "tractor beam". This graviton beam is capable of either attraction or repulsion.
The shuttlebays aboard Federation starships each have a tractor beam emitter mounted near the shuttlebay in order to guide shuttlecraft in. In addition, each shuttlebay has a tractor beam emitter mounted within.(TNG: "Time Squared")
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