seven-level

Meaning

Noun

• A person who has qualified for "Craftsman" level of skill in the United States Air Force, with more training than "Journeyman" (five-level), but less than a "Superintendent" (nine-level)
• Short for seven-level screwdriver, so-called because it was standard seven-level equipment.

Origin

• Shortened from a longer, bureaucratic US military designation (an Air Force Specialty Code), where '7' was code for "Craftsman".