noun, noun or participle which takes 'suru'
overpunch
Technical term used in data processing and punch-card systems; also used as a suru-verb.
このシステムでは、オーバパンチを使って特殊文字を表現する。
In this system, special characters are represented using overpunching.
古いパンチカードでは、数字
On old punch cards, they sometimes overpunched on top of numbers.