D5

The D5 paper size defined in China's distinctive D series measures 130 mm x 184 mm, occupying a smaller niche in the range of formats. With a surface area of just 0.02 square meters, its compact dimensions trace back to historic Chinese standardizations serving specialized requirements.

Measuring 5 1⁄8 inches wide by 7 1⁄4 inches high, the petite D5 sheet area suits lightweight needs like index cards, flashcards, recipe cards, and other portable or archival uses where minimal space is ideal. Its size also enables convenient digital scanning. However, the proportions still reasonably accommodate some simple tables and multi-paragraph text across its width when needed.

In essence, China's singular D paper size specifications and the portable D5 sheet offer standardized guidelines well-matched to lightweight notes, cards, and other modest document needs not covered by office/letter formats. As part of the specially developed series, the ultra-compact D5 demonstrates adaptation of Chinese paper dimensions even for petite niche applications within the documentation landscape.