complex numbers (https://en.wikipedia.org/wiki/Complex_number)
split-complex numbers (https://en.wikipedia.org/wiki/Split-complex_number)
quaternions (https://en.wikipedia.org/wiki/Quaternion)
bicomplex numbers (https://en.wikipedia.org/wiki/Bicomplex_number)
split-quaternions (https://en.wikipedia.org/wiki/Split-quaternion)
octonions (https://en.wikipedia.org/wiki/Octonion)
biquaternions (https://en.wikipedia.org/wiki/Biquaternion)
bioctonions (https://en.wikipedia.org/wiki/Bioctonion)
matrices (https://en.wikipedia.org/wiki/Matrix_(mathematics))
Gaussian integers (https://en.wikipedia.org/wiki/Gaussian_integer)
integers of a given modulus (https://en.wikipedia.org/wiki/Modular_arithmetic)
Eisenstein integers (https://en.wikipedia.org/wiki/Eisenstein_integer)
Hurwitz quaternion (https://en.wikipedia.org/wiki/Hurwitz_quaternion)
Lipschitz quaternion (https://en.wikipedia.org/wiki/Hurwitz_quaternion)
polynomials (https://en.wikipedia.org/wiki/Polynomial)
*p-adic numbers (https://en.wikipedia.org/wiki/P-adic_number)
dual numbers (https://en.wikipedia.org/wiki/Dual_number)
dual complex numbers ()
dual quaternions (https://en.wikipedia.org/wiki/Dual_quaternion)
split-biquaternions (https://en.wikipedia.org/wiki/Split-biquaternion)