One of those handy pieces of
office equipment that you've either
1) not bought because who needs them anyway
2) lost
and that you'll desperately need of at some point in time. Though not as badly as you might need a
stapler or
scissors.
A hole puncher punches holes in
paper. The larger ones even punch them with the correct
separation to fit the type of
binder that happens to be sold in your
country. The
single-hole punchers are painful; avoid at all costs.
Note that the holes punched out from the paper can be used as
confetti, if the need should arise.
Better holepunchers can typically handle thicker
stacks of paper.