noun
complex plane
Mathematical term for the plane representing complex numbers, with the real part on the x-axis and the imaginary part on the y-axis.
複素平面上で、実数は横軸に、虚数は縦軸に表される。
On the complex plane, real numbers are represented on the horizontal axis and imaginary numbers on the vertical axis.
Compound of 複素 (complex) and 平面 (plane). The term is a direct translation of the English 'complex plane'.