What is the alphanumeric representation of the imaginary number?

The alphanumeric representation of the imaginary number is "i." This representation is used to denote the square root of -1, which is not a real number. Imaginary numbers are used in mathematics to solve equations that involve square roots of negative numbers and are often used in complex numbers, which have both real and imaginary components. The letter "i" was chosen as the representation for the imaginary unit to avoid confusion and is widely accepted and used in mathematical calculations.