Ton

The ton (also spelt tonne) is a name of three different units of measurement, the long ton (2240 lb or 1016.047 kg), the short ton (2000 lb or 907.185 kg) and the metric ton (1000 kg). The first two are British Imperial (also called American) units, while the later is a non-SI metric unit.

Since all three have the same name, it can sometimes be difficult to tell which unit is being used.