wave vector

is: a generalization of the scalar angular wavenumber to a vector quantity which characterizes waves propagating in two- or three-dimensions. [P5.6]

has magnitude: equal to [P5.6]

has direction: parallel to the direction of propagation. [P5.6]

usually is denoted: by the symbol [P5.6]

more properly is referred to: as the angular wave vector, but this term is almost never used in practice. [P5.6]

is also referred to: as the propagation vector.