Most gang members have identifying characteristics which are unique to their specific clique or gang. The Bloods, for instance, wear red bandanas, the Crips blue, allowing these gangs to "represent" their affiliation. Any disrespect of a gang member's color by an unaffiliated individual is regarded as grounds for violent retaliation, often by multiple members of the offended gang. Tattoos are also common identifiers, such as an '18' above the eyebrow to identify a member of the 18th Street gang. Tattoos help a gang member gain respect within their group, and mark them as members for life. Tattoos can also represent the level they are in the gang, being that certain tattoos can mean they are a more accomplished member. The accomplishments can be related to doing an dangerous act that showed your loyalty to the gang. They can be burned on as well as inked. Some gangs make use of more than one identifier, like the Nortenos, who wear red bandanas and have "14", "XIV", "x4", and "Norte" tattoos.