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Lead is an element, number 82 on the periodic table.

Impulse pack

Decayed lead points on an impulse pack

Old 23rd century type impulse packs (part of the impulse engines) were insulated with an element that could decay to lead. When a ship had been through trauma it was best to check the points of the packs, because if they had decayed, when activated they could take out the entire impulse deck.

After encountering the galactic barrier, Lee Kelso checked the impulse engines and did not notice that the points were decayed. (TOS: "Where No Man Has Gone Before")

The surface temperature of the innermost planet of system L-374, of the two planets that survived the planet killer's attack, was that of molten lead. (TOS: "The Doomsday Machine")

Crewman Mariah Henley remarked that her legs felt "like lead pipes" even before Tuvok made her and other Maquis members of the USS Voyager crew run ten kilometers. (VOY: "Learning Curve")

Lead was mentioned in the final draft script of TOS: "The Corbomite Maneuver" (dated 3 May 1966), as that script referred to the Fesarius as being "in the shape of a round cluster of [...] lead shot." This allusion was written out of the teleplay by the time a second revised final draft of the script (dated 20 May 1966) was issued.

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