In the volume table on the Indodax market page, the terms "mn" and "bn" are often used to indicate the amount of trading volume for the last 24 hours on that coin. "Mn" stands for "million" which means million, while "bn" stands for "billion" which means billion. The use of these abbreviations helps make it easier for users to quickly read and understand trading volume data. For example, a volume of 10mn means 10 million units of a traded asset, and a volume of 1bn means 1 billion units.