PA10

At an absolutely miniscule 26mm x 35mm, the eccentric PA10 format has a surface area of just 0.0009 square meters. As the smallest entry in the supplementary PA paper size system, PA10 exists only as a nominal bridge between the extremely impractical PA9 and A10 sizes. Sharing the near pointless height of A10, PA10 tacks on an extra 9mm of width to little meaningful end. With its tiny dimensions not even amounting to an inch in any direction, unsurprisingly PA10 has no alternative names or acronyms. Likewise, it has no feasible real-world applications besides hypothetical novelty usecases only made possible by its marginal width over A10. As the final iteration of the PA series conceived in 1975, PA10’s origins and backstory lack any greater significance beyond filling an arbitrary paper size gap of questionable value. While the PA system faced wholesale rejection from ISO standards, that decision clearly did no disservice to the redundant PA10. Its sub one-inch dimensions render it little more than a theoretical footnote among paper formats. While PA10 technically fulfills its role as a single horizontal extension before A10, that purpose loses meaning once paper ceases to serve any useful function at such lilliputian scales.