अर्थ : A spirally grooved spindle in a clock that counteracts the diminishing power of the uncoiling mainspring.

अर्थ : A colored flare used as a warning signal by trucks and trains.

अर्थ : A friction match with a large head that will stay alight in the wind.

अर्थ : Any igniter that is used to initiate the burning of a propellant.