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Halfwidth and Fullwidth Forms is a Unicode block U+FF00–FFEF, provided so that older encodings containing both halfwidth and fullwidth characters can have lossless translation to/from Unicode. It is the second-to-last block of the Basic Multilingual Plane , followed only by the short Specials block at U+FFF0–FFFF.
Unlike monospaced fonts, a halfwidth character occupies half the width of a fullwidth character, hence the name. Halfwidth and Fullwidth Forms is also the name of a Unicode block U+FF00–FFEF, provided so that older encodings containing both halfwidth and fullwidth characters can have lossless translation to and from Unicode.
Japanese (OADG 109A) keyboard layout with Hiragana keys. Japanese Apple keyboard. The OADG 109A and older 109 keyboard layouts which are the standard for Microsoft Windows have five dedicated language input keys: [1] halfwidth/fullwidth/kanji (hankaku/zenkaku/kanji 半角 / 全角 / 漢字) at the top left key of the keyboard;
Unicode chart Halfwidth and Fullwidth Forms}} provides a table listing the characters in the Halfwidth and Fullwidth Forms Unicode block. Hangul and katakana subsets can be listed using an optional parameter.
Further, though JIS X 0201 is a single-byte encoding (and displayed at half-width) and JIS X 0208 is a double-byte encoding (and displayed at full-width), there is no connection between number of bytes and width (other than those corresponding in Shift JIS, as above) – for example, Unicode can be encoded with four bytes to display both full ...
Unicode input is method to add a specific Unicode character to a computer file; it is a common way to input characters not directly supported by a physical keyboard. Characters can be entered either by selecting them from a display, by typing a certain sequence of keys on a physical keyboard, or by drawing the symbol by hand on touch-sensitive ...
Microsoft was one of the first companies to implement Unicode in their products. Windows NT was the first operating system that used "wide characters" in system calls.Using the (now obsolete) UCS-2 encoding scheme at first, it was upgraded to the variable-width encoding UTF-16 starting with Windows 2000, allowing a representation of additional planes with surrogate pairs.
In version 16.0 (September 2024), Unicode was extended with another block containing many graphics characters, Symbols for Legacy Computing Supplement, which includes a few box-drawing characters and other symbols used by obsolete operating systems (mostly from the 1970s and 1980s).