Seen on IVLE forums

"I'm new to the NUS system and was wondering if someone can please tell me what foolscap paper is."

*scrambles quickly to dictionary*

1. Chiefly British A sheet of writing or printing paper measuring approximately 13 by 16 inches. 2. A fool's cap.

ETYMOLOGY: From the watermark of a fool's cap with bells originally used for this paper.

Source

Something i've always taken for granted, the word.