zone punch (English, noun)
expansion: zone punch (plural zone punches)
Senses:
topics: computing
engineering
mathematics
natural-sciences
physical-sciences
sciences
glosses: A hole punched (normally in the top two or three positions) of a punched card in addition to another in order to designate a different (sometimes related) character or to add a plus or minus sign
Forms:
form: zone punches
tags: plural