Foolscap
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Foolscap is lined, legal-size paper (a paper size found only in North America). It is called foolscap because, in the 18th century, folio-sized paper had the watermark of a fool's cap on it.
In the UK, foolscap paper is 13" X 8" (c 330mm X 203mm), but paper of the size is now very rarely used, being superseded by A4 (297 x 210). Older people may call A4 "foolscap". Nevertheless, ring binders, lever arch files, suspended files, and other filing related things still use the size.
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