You know what it looks like… but what is it called?
TAKE THE QUIZ“of metal”
The following 2 entries include the term of metal.
line of metal
: the line of sight passing along the upper surface of the tube of a cannon
weight of metal
: the total weight of the projectiles that can be fired from a single gun in a given time or of those that can be fired simultaneously from an assemblage of guns
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Merriam-Webster unabridged