Manchester United is called M16 because the club's original stadium, Old Trafford, is located in the M16 postal code area of Manchester, England. The "M" in M16 stands for Manchester, while the number 16 specifically refers to the postal code zone where the stadium is situated. This postal code designation has become a shorthand way to refer to the club, similar to how other sports teams are often associated with the area codes or postal codes of their home cities.
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The postal code for Old Trafford, Manchester United's home stadium, is M16 0RA.