Double-byte
From Wikicliki
Double-byte Character sets use two bytes for each character.
Asian languages far exceed the 256-character limit imposed by a single byte. Japanese, for example, uses about 2000 kanji for everyday purposes, more kanji for special vocabularies, two phonetic syllabaries, Latin alphabetic characters, Arabic numerals, and both Japanese and Western punctuation marks
It takes two bytes to assign a code point to each character, and programs written for single-byte code pages are not compatible with double-byte languages, which is why on certain program interfaces, all the chinese characters start splitting up into gibberish.
