The normal distribution is sometimes informally called the bell curve. However, many other distributions are bell-shaped (such as the Cauchy, Student's t, and logistic distributions).
One metric ton (also known as a 'Tonne') contains 1000 kg, or 2204 pounds. There are two other types of ton: One Imperial ton (or British ton) equals 2240 pounds, or 1016.3 kg. One short ton contains 2000 pounds, or 907.4 kilogrammes.
A tonne, also known as a metric ton, is a unit of mass equaling 1,000 kilograms. American English speakers generally have no use for tonne, so the spelling rarely appears in U.S. publications. Elsewhere, fastidious publications use the appropriate spellings for the units of measurement.