the.com/caliber
The width of a barrel, borrowed to measure the size of a soul.
means The internal diameter of a gun barrel or bullet, or figuratively, a person's or thing's quality and ability.
from From Arabic qalib, a mold for casting metal, traveling through Italian and French into English gunnery before getting promoted to measuring human worth.
Tiny unitsMeasured in hundredths of an inch or millimeters.
Same rootCaliper, the tool, shares the molding ancestry.
Number gameA .45 means roughly forty-five hundredths of an inch.