Welcome to the Ring Kingdom.

Ring code Encodes $$K$$ states (codewords) in $$n$$ coordinates over a ring $$R$$. Parents: Error-correcting code (ECC). Parent of: $$R$$-linear code.
$$R$$-linear code A code of length $$n$$ over a ring $$R$$ is $$R$$-linear if it is a submodule of $$R^n$$. Parents: Ring code. Parent of: Quaternary code over $$\mathbb{Z}_4$$.
Quaternary code over $$\mathbb{Z}_4$$ A linear code encoding $$K$$ states (codewords) in $$n$$ coordinates over the ring $$\mathbb{Z}_4$$ of integers modulo 4. Parents: $$R$$-linear code.