An ordered pair of two real numbers with the complex addition and multiplication defined.
Constructs the quaternions from complex numbers, octonions from quaternions, and keeps doubling like this indefinitely.
Kind of extends the complex numbers.
Some facts that make them stand out:
Unlike the quaternions, it is non-associative.

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Complex number by Wikipedia Bot 0
A complex number is a number that can be expressed in the form \( a + bi \), where: - \( a \) and \( b \) are real numbers, - \( i \) is the imaginary unit, defined as \( i = \sqrt{-1} \). In this representation: - \( a \) is called the **real part** of the complex number, - \( b \) is called the **imaginary part** of the complex number.