M

the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards)

concentration measured by the number of moles of solute per liter of solution

the cardinal number that is the product of 10 and 100

a unit of information equal to 1000 kilobytes or 10^6 (1,000,000) bytes

a unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes

the 13th letter of the Roman alphabet

denoting a quantity consisting of 1,000 items or units