Seven-level Definition
noun
(military, US) A person who has qualified for "Craftsman" level of skill in the United States Air Force, with training more than "Journeyman" (five-level), but below "Superintendent" (nine-level)
Wiktionary
Short for seven-level screwdriver, so-called because it was standard seven-level equipment.
Wiktionary
Origin of Seven-level
Shortened from a longer, US military bureaucratic designation (Air Force Specialty Code), where '7' was code for "Craftsman".
From Wiktionary
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