名詞 foolscap:

1. a size of paper used especially in Britain

fools.cap

n.（名詞）
Abbr. fcp.,fcap.,fp.Chiefly British A sheet of writing or printing paper measuring approximately 3 by ' inches.
縮寫(xiě) fcp.,fcap.,fp.【多用于英國(guó)】 大頁(yè)書(shū)寫(xiě)紙：一張寫(xiě)字或打印的紙，尺寸大約為3×'英寸
A fool`s cap.
小丑帽

來(lái)源：
[From the watermark of a fool`s cap with bells originally used for this paper]
[由最初用這種紙做的上帶鈴鐺的小丑帽的水印圖案而來(lái)]