The number 511 is a numeric symbol for the Oregon-based racist prison gang European Kindred. Substituting letters for numbers, the 5 and 11 equate to E and K, i.e., European Kindred. Additional Images:

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. Additional Images:

83 is a white supremacist numeric symbol that stands for "Heil Christ" or "Hail Christ" (the eighth letter of the alphabet is H and the third letter is C, thus 83 is "HC"). It is typically used by adherents of the racist and anti-Semitic religious sect known as Christian Identity. The symbol derives from the older white supremacist numeric symbol 88 ("Heil Hitler"). As they do with 88, white supremacists sometimes pair 83 with the number 14 (a reference to the so-called "Fourteen Words" slogan…

88 is a white supremacist numerical code for Heil Hitler. Read more about the meaning behind the numbers, as well as how it’s used in non-extremist forms.

9% is a numeric white supremacist symbol that refers to the percentage of the world's population that is purportedly white.

The Solid Wood Soldiers are a Texas-based white supremacist prison gang. Their primary tattoo consists of the initials SWS, with the two S's represented by lightning bolts. Above the initials appears the image of a bear claw, with the number 4 in the middle and sometimes the letters HCRL.

The eleventh letter of the alphabet is the letter "K"; thus 3 times 11 equals "KKK," or Ku Klux Klan. The number 311 is sometimes used as a greeting to demonstrate membership in the KKK or simply sympathy with the Klan and its ideology. There is also a longstanding rock band from Nebraska that uses the name "311." This is not a hate-oriented band and should not be mistaken as such. Additional Images: