A1

See also: A 1, A-1, A-1+, and a1

Translingual

The relative size of A1 paper.

A1

(international standards) ISO 216 standard paper size of 594 mm × 841 mm (23.39 in × 33.11 in), with a surface area of 0.5 m² (5.38 sq ft).
(finance) Long-term bond credit rating by Moody's Investors Service, indicating that a bond is upper-medium grade with low risk of default.

From various rating systems, as that of Lloyd's of London or the condition of insured ships. First attested in 1837.

A1 (not comparable)

A1 (plural A1s)

Under the International Union of Railways (French: Union internationale des chemins de fer, UIC) classification system, a steam locomotive that has two coupled driving wheels followed by two trailing wheels, with no leading wheels; also called an 0-2-2.

A1

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Norwegian Bokmål Wikipedia has an article on:

A1

See the Wikipedia article ISO 216, the international standard on paper sizes.