SIS E3

With dimensions of 310 mm x 439 mm, the SIS E3 paper size has an area of about 0.14 square meters. Falling between SIS E2 and ISO A2 in the Swedish progression of width and height, it is one of the lesser used niche formats.

The SIS E3 does not tend to be known by any common alternate monikers. On occasion within Sweden, it may be referred to informally by its metric measurements.

Potential use cases include oversized charts or diagrams, some advertising posters, greeting cards, and decorative mailers. But everyday practical utility is minimal for the obscure SIS E3.

This incremental Swedish paper extension was part of an attempt to systematically bridge gaps between existing ISO standard sizes. The goal was to facilitate subtle scaling of content across multiple formats. However, the effort was undermined by deep entrenchment of A/B/C sizes, lack of global uptake, and economic inertia. So today SIS E3 remains narrowly relevant beyond specialized Swedish contexts as an esoteric sizing option, underscoring the resilience of prevailing norms. Its backstory is one of ambition thwarted by infrastructure rigidity and path dependence.