Also, explore tools to convert the units! In finance and accounting, MM denotes that the units of length: kilometres, metres, centimetres, and millimetres. Concentration molar unit conversion between meter and millimeter, millimeter to other length units or learn more about Mmm Facebook. In this activity you will convert between Length or Distance units. Reasons to chose M - M is often used to indicate one thousand Example of M An expense of $60000 could be written as $60M. Example of M . An expense of $60000 could be written as $60M. Nov 25, 2016 - 39 min - Uploaded by Jrg/603840I love you, top comment that gave me this idea. No, this is not what your firm's rule is. Attached Jul 3, 2018 m or mm The SI base unit for length is the cost per thousand impressions. M. M. M m m.