what is the 13 for in gangs ?

Tolga

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What is the 13 for in gangs?
Etymology and characteristics. While sur is the Spanish word for south, among Sureños "SUR" also stands for Southern United Raza. Sureños use the number 13—which represents the letter "M", the thirteenth letter of the alphabet—in order to mark their allegiance to the Mexican Mafia.