The Nuttall Encyclopedia
A fabulous animal like a horse, with a cubit and a half long horn on the forehead; was adopted by James I. as the symbol of Scotland on the royal arms; is in Christian art a symbol of the incarnation, and an emblem of female chastity.
Wood, James, ed. Entry for 'Unicorn'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/u/unicorn.html. Frederick Warne & Co Ltd. London. 1900.