- (written as M)1 048 576, equal to 220
- (written as M)M type stars are the coolest of all, with surface temperatures of less than 3500°. Such stars are cool enough to allow some molecules – rather than just isolated atoms – to exist in their outer layers. M stars tend to be orange in colour and Betelgeuse in Orion is the classic member of the class.
- (written as M)Prefix for object designations in the Messier Catalogue
- A prefix which serves to produce derivative words pertaining to mobile communications concepts. For instance, m-business, or m-mail. It is an abbreviation of mobile.
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