The equivalent of a barrel of oil - A unit of energy measurement, used mainly in the US and is defined as the amount of energy released by burning one barrel of crude oil.
Megatons of oil equivalent - It is a multiple of a ton of oil equivalent - energy unit used in the oil industry and is defined as the amount of energy released by burning one tonne of crude oil.
Gigatons oil equivalent - It is a multiple of a ton of oil equivalent - energy unit used in the oil industry and is defined as the amount of energy released by burning one tonne of crude oil.