A metron bomb is a weapon used by the Cylons.
In attempting to discover oddities in Specter's command of the Attila garrison, Lucifer discovers that Specter has ordered more of these weapons than any other garrison in the system (The Young Lords).
Galactica 1980 definition: a unit equivalent to 1 hectometer[1]
Original Series definition: unit of distance of smaller denomination than maxim, the Earth measurement being equivalent to meter; used in a deleted scene as Serina approaches the starboard landing bay (TOS: "Lost Planet of the Gods, Part II")