Standard characters for digital communication.

Mapping of characters to numbers.

Standardized encoding for all characters.

Standard characters for American encoding.

Labels encoding for specific characters.

Encoding using two bytes per character.

A double-byte character set is a character encoding in which either all characters (including control characters) are encoded in two bytes, or merely every graphic character not representable by an accompanying single-byte character set is encoded in two bytes (Han characters would generally comprise most of these two-byte characters).

The (UCS, Unicode) a standard set of characters defined by the international standard ISO/IEC 10646, Information technology — Universal Coded Character Set (plus amendments to that standard), which is the basis of many character encodings, improving as characters from previously unrepresented typing systems are added.