letter opener

Any of several devices for opening letters, either by breaking wax seals or (as is usually the case today) by cutting open their envelopes.

A device shaped like a fixed-blade knife, usually with a blunt edge; the blunt edge does not slice the envelope so much as precisely tear it.

Any of several devices for opening letters, either by breaking wax seals or (as is usually the case today) by cutting open their envelopes.

The same sort of device but with a sharpened edge, designed to appeal to customers who enjoy a sharpened one (regardless of whether or not it truly outperforms the nonsharp counterpart).

Any of several devices for opening letters, either by breaking wax seals or (as is usually the case today) by cutting open their envelopes.

A device incorporating a small razor-style blade in the crotch of a U-shaped plastic handle; it slices the envelope while being, like a safety razor, unlikely to cut the user accidentally.