A-format

Etymology
, first part is the first letter of the Norwegian alphabet. Last part probably from, of , from , present active infinitive of , from with an unknown descent, perhaps from some , connected by some with , possibly of  origin.

Noun

 * 1) standard paper format series based on the basic format A0 = 841 x 1189 mm and the surface content 1 m2, where each new format is half of the previous