Thin Line Meanings It started with the Thin Blue Line and with the rise of professions and support for protective services and first responders the thin lines have grown. We have the meanings of the most popular thin lines below.  Thin Blue Line Meaning    Essentially there are three meanings. The Thin Blue Line represents the thin line Police Officers walk daily between life and death. The Thin Blue Line represents the police officer role of separating the good from the bad while creating order from chaos. The Thin Blue Line on black is a memorial or a connection or memory between Officers killed in the line of Duty and those who continue with their duties in the present. Thin...