noun
code element; code value; coded representation
Technical computing term for a piece of data that represents something in encoded form, such as a code point, a value in a coding scheme, or a symbol in a coded character set.
この文字コード体系では、各文字に固有のコード化表現が割り当てられている。
In this character encoding system, each character is assigned a unique coded representation.
符号化 is the process of encoding, whereas コード化表現 is the resulting encoded form.
Compound of コード (code) + 化 (-ization) + 表現 (representation). A straightforward modern technical term.