noun
alphabet-name
Computing term for a name that identifies a character set or encoding, such as 'UTF-8' or 'Shift_JIS'.
このファイルの符号系名はUTF-8です。
The alphabet-name of this file is UTF-8.
Compound of 符号 (code, sign) + 系 (system) + 名 (name). The exact derivation is uncertain; it appears to be a technical term formed within computing contexts.