In North America, the closest type to A3 size paper is called Tabloid or Ledger. North America is among only a few remaining countries that don’t use the A series as its standard for paper sizes. Why does the US use different names for its paper sizes?
That’s why A0 is the largest paper size in the format. The smaller the number in the A paper size format, the larger it is. A3 is 297 mm x 420 mm whereas A5 is 148 mm x 210 mm.
