Mega is a unit prefix in the metric system denoting a factor of one million (10⁶ or ). Symbol (M). It was confirmed for use in the International System of Units (SI) in 1960. Mega comes from the Greek  , meaning "great".

Mega is a unit prefix in the metric system denoting a factor of one million (10⁶ or ). Symbol (M). It was confirmed for use in the International System of Units (SI) in 1960. Mega comes from the Greek  , meaning "great".