- 复数域 fùshùyù field of complex numbersthe field of complex numbers in mathematics, usually denoted by the symbol C
- 代数数域 dàishùshùyù algebraic number fielda finite-degree field extension of the field of rational numbers in mathematics
- 有理数域 yǒulǐshùyù field of rational numbersfield of rational numbers in mathematics, usually denoted by the symbol Q