What does M mean in Monopoly?

What does M mean in Monopoly? Monopoly Dollar, (represented by the currency sign ‘M'[1]) shortened to “Dollar”, is the main currency used in Monopoly. At the beginning of a game, each player gets 1,500 dollars, but his or her total changes almost every turn.

Monopoly Dollar, (represented by the currency sign ‘M'[1]) shortened to “Dollar”, is the main currency used in Monopoly. At the beginning of a game, each player gets 1,500 dollars, but his or her total changes almost every turn.