In this detail from an early 14th century copy of Euclid's Elements, a woman is shown teaching geometry. It is a detail of a scene in the bowl of the letter 'P'; the woman, with a set-square and dividers, uses a compass to measure distances on a diagram. In her left hand she holds a square, an implement for testing or drawing right angles. She is watched by a group of students. In images from the Middle Ages, it is unusual to see women represented as teachers, in particular when the students appear to be monks. She may be the personification of Geometry.