Most gang members have identifying characteristics unique to their specific clique or gang.[59] 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,[60] such as an '18' above the eyebrow to identify an 18th Street (gang) member. Tattoos help a gang member gain respect within their group, and mark them as members for life. 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.