Lead line

Lead line ("Leed" line) may refer to:
 * Lead line, used in depth sounding
 * 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