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It blows our hivemind that the United States doesn't use the ISO 216 paper size standard (A4, A5 and the gang).
Like, we consider ourselves worldly people and are aware of America's little idiosyncrasies like mass incarceration, the widespread availability of assault weapons and not being able to transfer money via your banking app, but come on - look how absolutely great it is to be European:
The American mind cannot comprehend this diagram
[Diagram of paper sizes as listed below]
ISO 216 A series papers formats
AO
A1
A3
A5
A7
A6
Et.
A4
Instead, Americans prostrate themselves to bizarrely-named paper types of seemingly random size: Letter, Legal, Tabloid (Ledger) and all other types of sordid nonsense. We're not even going to include a picture because this is a family-friendly finance blog.
11x17 is incredibly common too. Usually it is oriented landscape and z folded to get a large diagram into a document. It's kind of irritating that the most typical large format size is 24x36, which is a different aspect ratio than 11x17, for a variety of reasons. If you're designing something you need to know what aspect ratio to design for. Most copiers can do 11x17, and if the standard large format size was 22x34 it would be exceedingly easy for most offices to produce good working copies of large documents. Best compromise I've seen is when people put a logo or header on the side that can be omitted when you switch aspect ratios.