SIS E10

The extremely obscure SIS E10 paper size establishes very compact dimensions of 27 mm x 39 mm, enclosing just 0.0011 square meters. Nestled between rarely used SIS E9 and ISO A9, it represents one of the more obscure Swedish niche extensions.

Lacking any meaningful adoption, the SIS E10 format does not boast commonly used alternate name variants. Only in certain Swedish contexts might it ever be referred to informally by its metric measurements.

Realistic use cases are hard to identify due to its unfamiliarity, but perhaps could include novelty postcards and ornamental package inserts when even SIS E9 is deemed too large. However, the hyper-specific Swedish size interpolations utterly failed to displace ISO standards.

The SIS E10 emerged from Sweden's early 20th century endeavor to systematically insert granular sizes between ISO's prevailing A, B and C families. The vision was facilitating subtle content scaling across sheet formats. But the effort was undermined by economic factors around paper manufacturing, near total lack of international uptake, and systemic resistance to shifting norms. So today SIS E10 remains an obsolete curiosity, its backstory one of ambition colliding with material constraints and institutional inertia.