A compound, element, or isotope used to track the progress or history of a natural process.
A round of ammunition for a firearm that contains magnesium or another flammable substance arranged such that it will burn and produce a visible trail when fired in the dark.
The act or state of tracking or investigating something.
A request to trace the movements of a person or an object, such as a shipment.
A person who traces something.
A device or instrument used to assist in making tracings.
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