Chad (paper) device which will not punch a complete circle in the tape but, instead, will only cut approximately three-quarters of the circumference of a circle ... thereby leaving a movable, or hinged, lid of paper in the tape." In the "New Hacker's Dictionary", two unattributed and likely humorous derivations for "chad" are offered, a back-formation from a personal name "Chadless" and an acronym for "Card Hole Aggregate Debris". Other etymologies claim derivation from the Scottish name for river gravel, "chad", or the British slang for louse, "chat". When a chad is not fully detached, it is described by various terms corresponding
Hole punch and no choice of hole shape. In the United States, single hole punches are often used to punch holes through playing cards, marking them as "used" or "canceled". This helps cut down on cheating by eliminating any cards that may have been tainted by players. Paper drilling is also popular for this purpose. Single hole punches are widely used in the UK Civil Service where papers are punched with a single hole in the upper left, and secured using a treasury tag. A related office tool is the eyelet punch. This is a single-hole punch which also crimps a metal