Matte Black Plated with Thin Blue Line Pendant with ChainMen's Stainless Steel Black Plated with Blue Thin Line Cross Pendant with 24 inch long Black Round Wheat Chain. Thin Blue Line Jewelry by INOX Reminiscent of the blue in their uniforms, the thin blue line emblem has multiple meanings, all around the same concept, Police officers standing as the thin line that protects society from good and evil, chaos and order. It is also considered an homage to those fallen in the line of duty as it represents the