- 复数域 fùshùyù complex fieldfield of complex numbers in mathematics, usually denoted by C
- 共轭复数 gòng'èfùshù complex conjugate(math.) complex conjugate
- 复数平面 fùshùpíngmiàn complex plane(math.) complex plane; Argand plane
- 复数形式 fùshùxíngshì plural formthe plural form of a word, typically a countable noun