M&M's Hi-Protein Bar Chocolate 12x51g
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a b Perry, David J. (2006-08-01). "L2/06-269: Proposal to Add Additional Ancient Roman Characters to UCS" (PDF). Archived (PDF) from the original on 2019-06-14 . Retrieved 2018-03-24. The letter M is derived from the Phoenician Mem, via the Greek Mu (Μ,μ). Semitic Mem is most likely derived from a " Proto-Sinaitic" ( Bronze Age) adoption of the "water" ideogram in Egyptian writing. The Egyptian sign had the acrophonic value /n/, from the Egyptian word for "water", nt; the adoption as the Semitic letter for /m/ was presumably also on acrophonic grounds, from the Semitic word for "water", *mā(y)-.  Use in writing systems In Washo, lower-case ⟨m⟩ represents a typical em sound, while upper-case ⟨M⟩ represents a voiceless em sound.
Ruppel, Klaas; Aalto, Tero; Everson, Michael (2009-01-27). "L2/09-028: Proposal to encode additional characters for the Uralic Phonetic Alphabet" (PDF). Archived (PDF) from the original on 2017-10-11 . Retrieved 2018-03-24. The letter ⟨m⟩ represents the bilabial nasal consonant sound [ m] in the orthography of Latin as well as in that of many modern languages, and also in the International Phonetic Alphabet. In English, the Oxford English Dictionary (first edition) says that ⟨m⟩ is sometimes a vowel, in words like spasm and in the suffix -ism. In modern terminology, this is described as a syllabic consonant (IPA [m̩]). M is the fourteenth most frequently used letter in the English language. Archaic M was used in ancient Roman texts to abbreviate the personal name 'Manius' (A regular capital M was used for the more common personal name 'Marcus') 
Gordon, Arthur E. (1983). Illustrated Introduction to Latin Epigraphy. University of California Press. pp. 45. ISBN 9780520038981 . Retrieved 3 October 2015. roman numerals. Some symbols related to M were used by the Uralic Phonetic Alphabet prior to its formal standardization in 1902:  Figure Two: "Representative selection of proto-Sinaitic characters with comparison to Egyptian hieroglyphs", (p. 38)
Constable, Peter (2003-09-30). "L2/03-174R2: Proposal to Encode Phonetic Symbols with Middle Tilde in the UCS" (PDF). Archived (PDF) from the original on 2017-10-11 . Retrieved 2018-03-24. a b c d e "What does M stand for?". The Free Dictionary. Archived from the original on 25 November 2020 . Retrieved 9 February 2021. Figure Three: "Chart of all early proto-Canaanite letters with comparison to proto-Sinaitic signs" (p. 39),
The Roman numeral M represents the number 1000, though it was not used in Roman times. There is, however, scant evidence that the letter was later introduced in the early centuries A.D. by the Romans.  m is the standard abbreviation for metre (or meter) in the International System of Units (SI).  However, m is also used as an abbreviation for mile.  The Teuthonista phonetic transcription system uses U+AB3A ꬺ LATIN SMALL LETTER M WITH CROSSED-TAIL 
M" Oxford English Dictionary, 2nd edition (1989); Merriam-Webster's Third New International Dictionary of the English Language, Unabridged (1993); "em," op. cit.
Everson, Michael; etal. (2002-03-20). "L2/02-141: Uralic Phonetic Alphabet characters for the UCS" (PDF). Archived (PDF) from the original on 2018-02-19 . Retrieved 2018-03-24.