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In China, neima is the encoding of a character in some character set, or to the character encoding being used. It is not an encoding in itself, and the actual encoding being referred to has to be determined by context.
On any computer system, the internal code is the native encoding being used. For example, in a Big5-based system , the internal code is Big5; similarly, in a GB-based system , the internal code would be GB 2312. On early computers, the Chinese language card takes the internal codes and renders the corresponding Chinese characters on the screen. On many modern operating systems , the internal code is a form of Unicode.
Within a particular encoding, the internal code of a certain character simply means the value of the code point used to represent that character. For example, in the Big5 encoding, the character "一" has the internal code of A440 ; in the GB encoding, the same character has the internal code of D2BB.