Shuttle

Boyd’s Bible Dictionary:

(shooter). This weaver’s device for throwing the filling thread between the warp threads is figurative of fleeting time in Job 7:66My days are swifter than a weaver's shuttle, and are spent without hope. (Job 7:6).

Concise Bible Dictionary:

The well-known weaver’s implement which carries a thread, mentioned as early as Job 7:6: it is referred to as an emblem of swiftness.