K-frame

In linear algebra, a branch of mathematics, a k"-frame is an ordered set of "k" linearly independent vectors in a vector space; thus "k" ≤ "n", where "n" is the dimension of the space, and if "k" = "n" an n"-frame is precisely an ordered basis.
If the vectors are orthogonal, or orthonormal, the frame is called an orthogonal frame, or orthonormal frame, respectively.