The thirteenth letter of the Latin alphabet, M, represents the bilabial nasal consonant sound [m] in Classical languages as well as the modern languages. It derives its shape from the Greek Μ or μ. Semitic Mem originally pictured water, in all probability.
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z
M is also the name of a 1931 movie directed by Fritz Lang about a serial killer who preys on children. There is also a 1951 movie