A Shuttle

Shuttle - Wikipedia

1. (weaving) The part of a loom that carries the woof back and forth between the warpthreads.Shuttle (weaving) - Wikipedia
2. The sliding thread holder in a sewing machine, which carries the lower thread through a loop of the upper thread, to make a lock stitch.
3. A transport service (such as a bus or train) that goes back and forth between two places, sometimes more.
4. Such a transport vehicle; a shuttle bus; a space shuttle.
5. Any other item that moves repeatedly back and forth between two positions, possibly transporting something else with it between those points (such as, in chemistry, a molecular shuttle).
6. A shuttlecock.
7. A shutter, as for a channel for moltenmetal.

Usage notes

Strictly speaking, a shuttle goes back and forth between two places. However, the term is also used more generally for short-haul transport that may be one-way or have multiple stops (including shared ride or loop), particularly for airport buses; compare loose usage of limousine.