A sailing ship crew manages the running rigging of each square sail. Each sail has two sheets that control its lower corners, two braces that control the angle of the yard, two clewlines, four buntlines and two reef tackles. All these lines must be manned as the sail is deployed and the yard raised. They use a halyard to raise each yard and its sail; then they pull or ease the braces to set the angle of the yard across the vessel; they pull on sheets to haul lower corners of the sail, "clews", out to yard below. Under way, the crew manages "reef tackles", "haul leeches", "reef points", to manage the size and angle of the sail; "bowlines" pull the leading edge of the sail ("leech") taut when close hauled. When furling the sail, the crew uses "clewlines", haul up the clews and "buntlines" to haul up the middle of sail up; when lowered, "lifts" support each yard.