In 1866, Karl Theodor Reye (1838- 1919) proposed the plan of using capital letters for points, lower case letters for lines, and lower case Greek letters for planes in a remarkable two-volume work on geometry, Die Geometrie der Lage ( Cajori vol. ![]() Euler used capital letters for the angles. Leonhard Euler and Thomas Simpson reintroduced this scheme many years later, Euler using it in 1753 in Histoire de l'académie de Berlin (Cajori vol 2., page 162). In his notation, A was the largest side and C the smallest ( Cajori vol. Richard Rawlinson in a pamphlet prepared at Oxford sometime between 16 used A, B, C for the sides of a triangle and a, b, c for the opposite angles. 1, page 420, attributed to Moritz Cantor ). The designation of points, lines, and planes by a letter or letters was in vogue among the ancient Greeks and has been traced back to Hippocrates of Chios (about 440 B.
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