MGM
n. uncountablen. Stands for Metro-Goldwyn-Mayer. A famous American movie studio known for its lion logo and classic films.
n. Abbreviation for Metro-Goldwyn-Mayer. An American media company and film studio, historically significant for its dominance during the Hollywood Golden Age. Typically used without an article.
MGM produced many famous musicals in the 1950s.
The roaring lion at the start of the film is the iconic trademark of MGM.
During the studio system era, MGM was renowned for its roster of stars and high production values, famously claiming to have more stars than there are in the heavens.
As a proper noun identifying a specific entity, it does not take a plural form and usually appears without 'the' unless referring to 'the MGM lion' or 'the MGM studio'.