Prout (unit)

The Prout is an obsolete unit of energy, whose value is:
This is equal to one twelfth of the binding energy of the deuteron.

History

The "Prout" is a unit of nuclear binding energy, and is 1/12 the binding energy of the deuteron, or 185.5 keV.
This unit is named after William Prout, who first proposed a quantum of mass.
"Proutons" was an early candidate for the name of what are now called protons.
This unit was used in the mid-19th century by several physicists, including Marignac, who first proposed it in 1844.