Smiles, Frowns, and Upside Downs

Smiles, Frowns, and Upside Downs - (informal) The accidental deviations from the uniform alignment of envelopes on a facer-canceler or letter sorting machine. When the back of the envelope faces the machine or operator, it is either a smile (flap makes a V) or a frown (flap is inverted); when the address side faces the machine but is inverted, the envelope is called an upside down.

[Category=Postal ]

Source: USPS, 30 October 2009 15:34:51, http://www.usps.com/cpim/ftp/pubs/pub32/pub32q_z.html