Lead line ("Leed" line) may refer to: Leadline, a horse show class for children Lead (tack), for leading livestock Leash, for dogs and other small animals And also to ("Led" line): Burton line, a symptom of lead poisoning Sounding line, an instrument used in navigation to measure water depth (the plummet, or weight, is usually composed of lead) Radiation shielding: "lead-lined" containers for shielding radiation