It is the 2,000 pound one. There are two other units of ton.
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There are two types of tonnes, with a slightly different mass. A ton is equal to 2000 pounds. Another type of ton (sometimes called "metric ton" to clarify) is equal to 1000 kilograms.
1 'customary' ton = 2,000 pounds, anywhere 1 metric ton = 1,000 kilograms of mass It weighs 2,204.6 pounds on Earth, but different amounts in other places.
One 'metric ton'. On earth, that much mass weighs roughly 2204.62 pounds (rounded), or 10.23% more than a 'customary' ton.
A ton - sometimes called "metric ton", to avoid confusion with the other ton - is equal to 1000 kilograms. Metric prefixes (Mega, Giga, Tera, ...) might be used for larger units, but it is customary to specify larger masses either in kilograms or in tons.
It is a customary unit.