It is believed to be the initial of the first name of James
Bond's boss.
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Since 1995, the character of M has been portrayed by Dame Judi Dench in the James Bond films.
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skyfall
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James Bond's immediate superior in the novels and films is M, as portrayed by Bernard Lee, Robert Brown, and Judi Dench. it is revealed in the novel The Man with the Golden Gun that M's real name is Sir Miles Messervy.