![]() The DL envelope originated in Germany in the 1920's and was then known as DIN Lang, however these days DL is known to stand for 'Dimension Lengthwise'. What is a DL envelope? And what does DL stand for?.Therefore the number increases as it relates to the number of folds. ![]() For example, A2 paper is A0 folded twice, A3 paper is A0 folded 3 times, A4 paper is A0 folded 4 times. The number next to the A specifies the number of folds in half needed from an A0. The ISO standard paper sizing system works by using A0 size paper as the base point and largest size. This is because envelope sizing is based on the ISO paper size system, so a C5 envelope is designed to fit A5 paper and a C4 envelope is designed to fit A4 paper.
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