shuttle
n//ˈʃʌtəl//skyttel, skyttelbuss, skytteltrafik
(weaving) A tool used to carry the woof back and forth between the warp threads on a loom.
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.
A transport service (such as a bus or train) that goes back and forth between two or more places.