plural of 0-4-0

plural of 4-10-0

plural of 4-6-0

plural of 4-2-2

plural of 4-2-4

plural of 4-8-0

plural of λ/4 film

(technology) Film having a retardation of a quarter of a specified wavelength, used with a polarizer film to lower the reflectance of a display significantly.

plural of 4-3 suspension

A musical device, commonplace in the Western classical tradition, whereby a suspension is formed through a note a fourth above the bass which resolves to a third.