All stationery that the postal authorities issue and has a design indicating its postage value may be referred to as postal stationary. The most typical types of postal stationery are: newspaper wrappers, postal cards, letter cards, and stamped envelopes and letter sheets (including aerogrammes).
The term postal stationery means is, which stationaries items we can post by post office. We can post stamped envelopes, letter sheets, postal cards, letter cards, aerograms wrapped, etc.
Postal stationery refers to paper items such as postcards, stamps envelopes, and litter sheets that are manufactured by postal services in a country to use in sending mail.