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c. Designating a watermark consisting of a jester wearing a fool's cap (see fool's cap n.¹ 1a) and a collar with multiple points used on foolscap paper, as in foolscap watermark, foolscap mark. Now historical. In quot. 1872 the phrase old foolscap mark refers to the watermark depicting a jester’s cap, but the sense of foolscap mark itself is only ‘a watermark used on foolscap paper’; an image of a Britannia watermark is captioned ‘Modern Foolscap Mark’.Cf. sense 2.