D3

The D3 paper size defined in China's special D series has dimensions of 264 mm x 376 mm. With a 0.10 square meter surface area, it falls midway within the range of sizes in the series. Originating from historic Republic of China standardizations, D3 meets particular domestic needs not served by globally aligned formats.

At 10 3⁄8 inches wide and 14 19⁄24 long, the D3 sheet area can accommodate binding on the long side for lengthy documents. Its width facilitates complex tables, multi-column spreads, and large figures that would be cramped on A4/B5 pages. Some common applications utilizing its capabilities include financial filings, scientific journals, engineering data tables, and educational posters. The size also lends convenience for drafting intermediate-scale architectural plans.

In essence, China's one-of-a-kind D size specifications and the middle-ground D3 format offer standardized dimensions for documents that call for more expansive sheets than office/letter standards but less area than the very big D0-D2 sizes used for oversized plans and spreads. As part of the specially adapted series, D3 exemplifies tailored paper sizes matching Chinese usage precedents.