| Subject | English | Spanish |
| comp., MS | complex number | número complejo (A number in the form a + bi, where a and b are real numbers and i = sqrt(-1) , so that bi is imaginary unless b = 0) |
| scient. | complex number | número complejo |
| math. | complex number | el número complejo |
| IT | conjugate complex numbers | números complejos conjugados |