From my FDLE Florida Basic Recruit Training Program Law Enforcement Academy Vol. 1 Version 2017.07 textbook
Ch. 3 Interactions in a Diverse Community
Unit 4: Identifying High Risk Groups
Lesson 1: Criminal Gangs
Page 147 - Gang Identifiers
"People Nation gang members may use symbols such as the number five, a five-pound corwn, a five-pointed star, a rabbit with straight ears, pitchforks pointed down, an inverted number six, and left identifiers(such as forming hand signs with the left hand, wearing hats to the left, or rolling up the left pant leg). Bloods identify with the color red. Latin Kings identify with the colors black and gold. People Nation members wear clothing affiliated with some of the following professional sports teams: Atlanta Falcons, Chicago Bulls, Pittsburgh Pirates, and New Orleans Saints.
Folk Nation gang members may use symbols such as the number six, a six-pointed star, pitchforks pointed up, a rabbit with a bent ear, a winged heart, an inverted number five, a devil's tail, and right identifiers (such as wearing articles of clothing to the right or rolling up the right pant leg). Crips and Sur-13 identify with the color blue. Folk Nation members wear clothing affiliated with some of the following professional sports teams: Detroit Tigers, Kansas City Royals, Los Angeles Raiders, and Orlando Magic.
OMGs (outlaw motorcycle gangs) identify themselves differently than other criminal gangs. Typically, OMG members will wear patches to identify their membership and gang affiliation. Members wear what is referred to as a cut of colors, which is a vest or jacket that bears their gang patch. These patches may include a "rocker panel" which refers to the member's chapter. The patches may also refer to the member's status in the gang. For instance, members may wear patches that say "president" or "sergeant at arms." Some OMGs refer to themselves as "1 percenters" (1%), referring to the 1 percent of motorcycle gangs who break the law. The type, color, or style of motorcycle may also indicate OMG affiliation."
There's also some stuff about skinheads but we'll save that for Matt Nagy.