👉 In mathematics, orthonormality refers to a set of vectors that are orthogonal (perpendicular) to each other. In other words, two vectors are orthonormal if they have the property that their dot product is zero. This means that the magnitude (or length) of each vector is equal to one. The term "orthonormal" comes from the Greek word 'orthos', meaning perpendicular, and 'norma', meaning direction. An orthonormal set can be used