_Mu_ varies as much as most letters. Its normal shape, resembling the English M, is retained in the Rosetta stone and most inscriptions, but at an early period there was a tendency to make the letter broader, and not to bring the re-entering or middle angle so low as in English (e.g. Codd. Vaticanus and Sinaiticus). In Cod. Ephraemi this central angle is sometimes a little rounded: in Codd. Alex. and Parham 18 the lines forming the angle do not always spring from the top of the vertical lines: in Arund. 547 (No. 16) they spring almost from their foot, forming a thick inelegant loop below the line, the letter being rather narrow: Harl. 5598 (No. 7) somewhat resembles this last, only that the loop is higher up. In the Herculanean rolls (and to a less extent in the Cotton Genesis) the two outer lines cease to be perpendicular, and lean outwards until the letter looks much like an inverted W (No. 10). In the papyrus Hyperides (No. 9) these outer lines are low curves, and the central lines rise in a kind of flourish above them. _Mu_ assumes this shape also in Cod. T, and at the end of a line even in Codd. Vaticanus and Sinaiticus. This form is so much exaggerated in some examples, that by discarding the outer curves we obtain the shape seen in Cod. Z (Nos. 6, 18) and one or two others (e.g. Paul M in Harl. 5613, No. 34), almost exactly resembling an inverted pi. So also in the Isaiah of Cod. Z, only that the left side and base line were made by one stroke of the pen. _Nu_ is easier, the only change (besides the universal transition from the square to the oblong in the later uncials) being that in a few cases the thin cross line does not pass from the top of the left to the bottom of the right vertical line as in English (N), but only from about half-way or two-thirds down the left vertical in the Cotton Genesis, Codd. A, Rossanensis, Harl. 5598 (No. 7), and others; in Codd. אNR Parham 18 it often neither springs from the top of one, nor reaches the foot of the other (Nos. 4, 5, 11b, 12, 36); while in Cod. Claromont. (No. 41) it is here and there not far from horizontal. In a few _cursives_ (e.g. 440 Evan. at Cambridge, and Tischendorf’s loti or 61 of the Acts), H and N almost interchange their shapes: so in Evan. 66 and Wake 34 at the end of a line only.