Sending registered mail
A registered envelope is a form of postal stationery consisting of a strong envelope with an imprinted stamp used for sending registered mail. The envelopes include a perpendicular blue cross and an R in a circle symbol, both internationally recognised symbols of registered mail. The imprinted stamp on the flap shows the fee for the registration service, while a space is left for a postage stamp to be affixed to pay the postage fee. Confusingly, the envelopes are usually marked Registered Letter but that term strictly only relates to a normal letter or packet that has extra postage and markings applied so that it may travel under the registered mail service.