defines a similar list of envelope formats.

DL comes from the DIN Lang (German: "Long") size envelope which originated in the 1920s.

North American sizes

There are dozens of sizes of envelopes available in the United States.

The designations such as "A2" do not correspond to ISO paper sizes. Sometimes, North American paper jobbers and printers will insert a hyphen to distinguish from ISO sizes, thus: A-2.

The No. 10 envelope is the standard business envelope size in the United States.PWG 5101.1 also

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