Explanation of the signs.

L.?
3.?
B.?

B₂ = Codex 101 of the Barberini library, 15th century, which contains the first sixteen pages of the Hervagius edition up to the word dianoētikēn discursive/intellectual on line 21 from the bottom of page 16.

B₃ = Codex 145 of the Barberini library, 16th century, written by two copyists, the first of whom wrote out folios 1–158, the other folios 159–200.

A = Eukleidou Stoicheia Euclid’s Elements edited by E. F. August (part one, pages 290–293, 307–308), Berlin 1826.

N = Die Algebra der Griechen The Algebra of the Greeks. By Dr. G. H. F. Nesselmann, Berlin 1842.

Kn. I = From the commentaries of Proclus the Successor on Euclid’s elements, the exposition of the fourth definition, which is about the straight line and the spiral sections, commented upon by I. H. Knoche and F. I. Maerker, Herford 1856.

Kn. II = Untersuchungen über des Proklus Diadochus Commentar zu Euklids Elementen Investigations on Proclus Diadochus’s Commentary on Euclid’s Elements by Dr. J. H. Knoche, Herford 1862.

Kn. III = Untersuchungen über die neuaufgefundenen Scholien des Proklus Diadochus zu Euklids Elementen Investigations on the newly discovered scholia of Proclus Diadochus on Euclid’s Elements by Dr. Joachim Heinrich Knoche, senior teacher and co-rector, Herford 1865.

H₁ = Zu Proklos On Proclus. Dresden. Fr. Hultsch. (Rheinisches Museum für Philologie. New Series. Nineteenth Year. Frankfurt am Main 1864, pp. 450–455).

H₂ = Heronis Alexandrini geometricorum et stereometricorum reliquiae Relics of the geometric and stereometric works of Hero of Alexandria edited by Fridericus Hultsch, Berlin 1864.

T = The philosophical and mathematical commentaries of Proclus on the first book of Euclid's elements. In two volumes. London, printed for the author (T. Taylor) 1792.