noun
direction coefficient
Technical term used in mathematics, physics, or engineering to describe a coefficient related to direction, such as a directional derivative or a factor in a directional equation.
この方程式の方向係数を求めてください。
Please find the direction coefficient of this equation.
Compound of 方向 (direction) and 係数 (coefficient). The exact historical derivation is uncertain; the term is a modern technical coinage.