The number 737 is a numeric symbol used by Public Enemy Number 1 (PENI), a California-based white supremacist gang present on California's streets and in its prisons. Unlike most white supremacist numeric symbols, 737 is not an example of number-letter substitution. Instead, the numbers 737 correspond to the letters P, D, and S on a telephone keypad. The initials PDS stand for Peni Death Squad, another name for the group.
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