- The long line of people, in a primitive firefighting technique, who pass buckets of water hand-to-hand from the nearest water source to the site of a fire, in an attempt to douse it.
- (by extension) any process in which something is passed along a chain.
- (electronics) A discrete-time analogue delay line that moves a signal along a line of capacitors, one step at each clock cycle.
any process in which something is passed along a chain
electronics: discrete-time analogue delay line