D8

The smallest format in the D series prescribed by the 1922 German standard DIN 476, D8 measures just 48 mm wide by 68 mm tall. With a surface area of 0.0033 square meters, the miniscule dimensions served highly specialized technical literature needs in the era preceding adoption of ISO 216 formats. In particular, the elongated width-to-height ratio of 1.25 better suited narrow graphical presentations than the squarer A8 size. The UK "Post Octavo" papers again share a close correspondence to D8 as well.

Likely adapted from obscure German and Prussian graphical formats used in engineering and book printing applications, D8 occupied an ultra-niche role. Its narrow width facilitated tabular ledgers and schematics exceeding what ISO A8 could accommodate. Ultimately superseded by standardized sizes, D8 and other minor D variants endured as a testament to DIN 476's ambitions to comprehensively furnish documents of not just common office sizes, but practically any dimensional scale. While a relic today, D8 represented the extreme end of meticulously incrementing sizes spanning vast technical drawings down to miniscule diagrams.