A registered envelope is a form of postal stationery consisting of a strong envelope with an imprinted stamp or indicia used for sending registered mail. The envelopes usually include a perpendicular blue cross and an R in a circle symbol, both internationally recognised symbols of registered mail.
A registered envelope is a form of postal stationery consisting of a strong envelope with an imprinted stamp or indicia used for sending registered mail. The envelopes usually include a perpendicular blue cross and an R in a circle symbol, both internationally recognised symbols of registered mail.
Source: Wikipedia "Registered envelope" · CC BY-SA 4.0
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