100% is shorthand among white supremacists for "100% white," though it is also common for them to write out the entire phrase. Among prison populations and places such as California where peckerwood gangs are common, one might also see "100% peckerwood," "100% featherwood," or "100% wood." 

Variations abound. Some white supremacists will refer to themselves as "101% white," for example. Occasionally the percentage "123%" appears, which also means "100% white," as the 23 refers to W, the 23rd letter of the alphabet. Some white supremacist gang members may substitute an alphanumeric equivalent, such as "112%" to refer to "100% Aryan Brotherhood" or "113%" to refer to "100% Aryan Circle." 

Additionally, caution must be used in evaluating instances of this symbol's use, as most uses of this symbol are not, in fact, white supremacist in nature.

This database provides an overview of many of the terms and individuals used by or associated with movements and groups that subscribe to and/or promote extremist or hateful ideologies.