The international paper size standard, ISO 216, is based on the German DIN 476 standard for paper sizes. Its scalability is that cutting a sheet of larger size in half would produce two sheets of the next smaller size, so folding any sheet in half, the two halves have the same proportions.
Besides the ISO standard, the American National Standards Institute in 1995 adopted ANSI/ASME Y14.1 which defined a regular series of paper sizes. This standard is based upon the de facto standard 8½ in × 11 in "letter" size which it assigned "ANSI A". This series also includes "ledger"/"tabloid" as "ANSI B".
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