Precomposed Character

	Precomposed Character A precomposed character (alternatively composite character or decomposable character) is a Unicode entity that can also be defined as a sequence of one or more other characters. A precomposed character may typically represent a letter with a diacritical mark, such as ''é'' (Latin small letter ''e'' with acute accent). Technically, ''é'' (U+00E9) is a character that can be decomposed into an equivalent string of the base letter ''e'' (U+0065) and combining acute accent (U+0301). Similarly, ligatures are precompositions of their constituent letters or graphemes. Precomposed characters are the legacy solution for representing many special letters in various character sets. In Unicode, they are included primarily to aid computer systems with incomplete Unicode support, where equivalent decomposed characters may render incorrectly. Comparing precomposed and decomposed characters In the following example, there is a common Swedish surname Åström written in the two alternative me ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Unicode Unicode, formally The Unicode Standard,The formal version reference is is an information technology Technical standard, standard for the consistent character encoding, encoding, representation, and handling of Character (computing), text expressed in most of the world's writing systems. The standard, which is maintained by the Unicode Consortium, defines as of the current version (15.0) 149,186 characters covering 161 modern and historic script (Unicode), scripts, as well as symbols, emoji (including in colors), and non-visual control and formatting codes. Unicode's success at unifying character sets has led to its widespread and predominant use in the internationalization and localization of computer software. The standard has been implemented in many recent technologies, including modern operating systems, XML, and most modern programming languages. The Unicode character repertoire is synchronized with Universal Coded Character Set, ISO/IEC 10646, each being code-for-code id ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Chinese Characters Chinese characters () are logograms developed for the writing of Chinese. In addition, they have been adapted to write other East Asian languages, and remain a key component of the Japanese writing system where they are known as ''kanji''. Chinese characters in South Korea, which are known as ''hanja'', retain significant use in Korean academia to study its documents, history, literature and records. Vietnam once used the '' chữ Hán'' and developed chữ Nôm to write Vietnamese before turning to a romanized alphabet. Chinese characters are the oldest continuously used system of writing in the world. By virtue of their widespread current use throughout East Asia and Southeast Asia, as well as their profound historic use throughout the Sinosphere, Chinese characters are among the most widely adopted writing systems in the world by number of users. The total number of Chinese characters ever to appear in a dictionary is in the tens of thousands, though most are graphic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Arabic Presentation Forms-B Arabic Presentation Forms-B is a Unicode block encoding spacing forms of Arabic diacritics, and contextual letter forms. The special codepoint ZWNBSP is also here, which is only meant for a byte order mark The byte order mark (BOM) is a particular usage of the special Unicode character, , whose appearance as a magic number at the start of a text stream can signal several things to a program reading the text: * The byte order, or endianness, of th ... (that may precede text, Arabic or not, or be absent). The block name in Unicode 1.0 was Basic Glyphs for Arabic Language; its characters were re-ordered in the process of merging with ISO 10646 in Unicode 1.0.1 and 1.1. The presentation forms are present only for compatibility with older standards, and are not currently needed for coding text.The Unicode ConsortiumThe Unicode Standard, Version 6.0.0 (Mountain View, CA: The Unicode Consortium, 2011. )Chapter 8/ref> Block History The following Unicode-related documents record th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Arabic Presentation Forms-A Arabic Presentation Forms-A is a Unicode block encoding contextual forms and ligatures of letter variants needed for Persian, Urdu, Sindhi and Central Asian languages. This block also allocates 32 noncharacters in Unicode, designed specifically for internal use. The presentation forms are present only for compatibility with older standards such as codepage 864 Code page 864 (CCSID 864) (also known as CP 864, IBM 00864) is a code page used to write Arabic in Egypt, Iraq, Jordan, Saudi Arabia, and Syria. CCSID 17248 is the euro currency update of code page/CCSID 864. The euro sign was assigned to the ... used in DOS, and are typically used in visual and not logical order.The Unicode ConsortiumThe Unicode Standard, Version 6.0.0 (Mountain View, CA: The Unicode Consortium, 2011. )Chapter 8/ref> It has been agreed no further presentation forms will be encoded; a contiguous range of 32 noncharacters have been allocated here, and further encodings serve only as fillers. Block H ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Alphabetic Presentation Forms Alphabetic Presentation Forms is a Unicode block containing standard ligatures for the Latin, Armenian, and Hebrew scripts. Block History The following Unicode-related documents record the purpose and process of defining specific characters in the Alphabetic Presentation Forms block: See also Armenian (Unicode block) Latin alphabet in Unicode * Hebrew alphabet in Unicode Precomposed character Arabic Presentation Forms-A Arabic Presentation Forms-B Arabic Presentation Forms-B is a Unicode block encoding spacing forms of Arabic diacritics, and contextual letter forms. The special codepoint ZWNBSP is also here, which is only meant for a byte order mark The byte order mark (BOM) is a parti ... References {{reflist Unicode blocks Latin script ... [...More Info...] [...Related Items...] OR:* [Wikipedia] [Google] [Baidu]
	Unicode Compatibility Characters In Unicode and the UCS, a compatibility character is a character that is encoded solely to maintain round-trip convertibility with other, often older, standards. As the Unicode Glossary says: A character that would not have been encoded except for compatibility and round-trip convertibility with other standards Although ''compatibility'' is used in names, it is not marked as a property. However, the definition is more complicated than the glossary reveals. One of the properties given to characters by the Unicode consortium is the characters' decomposition or compatibility decomposition. Over five thousand characters do have a compatibility decomposition mapping that compatibility character to one or more other UCS characters. By setting a character's decomposition property, Unicode establishes that character as a compatibility character. The reasons for these compatibility designations are varied and are discussed in further detail below. The term ''decomposition'' sometimes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Complex Text Layout Complex text layout (CTL) or complex text rendering is the typesetting of writing systems in which the shape or positioning of a grapheme depends on its relation to other graphemes. The term is used in the field of software internationalization, where each grapheme is a character. Scripts which require CTL for proper display may be known as complex scripts. Examples include the Arabic alphabet and scripts of the Brahmic family, such as Devanagari, Khmer script or the Thai alphabet. Many scripts do not require CTL. For instance, the Latin alphabet or Chinese characters can be typeset by simply displaying each character one after another in straight rows or columns. However, even these scripts have alternate forms or optional features (such as cursive writing) which require CTL to produce on computers. Characteristics requiring CTL The main characteristics of CTL complexity are: * Bi-directional text, where characters may be written from either right-to-left or left-to-right di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Combining Character In digital typography, combining characters are characters that are intended to modify other characters. The most common combining characters in the Latin script are the combining diacritical marks (including combining accents). Unicode also contains many precomposed characters, so that in many cases it is possible to use both combining diacritics and precomposed characters, at the user's or application's choice. This leads to a requirement to perform Unicode normalization before comparing two Unicode strings and to carefully design encoding converters to correctly map all of the valid ways to represent a character in Unicode to a legacy encoding to avoid data loss. In Unicode, the main block of combining diacritics for European languages and the International Phonetic Alphabet is U+0300–U+036F. Combining diacritical marks are also present in many other blocks of Unicode characters. In Unicode, diacritics are always added after the main character (in contrast to some older c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Compose Key A compose key (sometimes called multi key) is a key on a computer keyboard that indicates that the following (usually 2 or more) keystrokes trigger the insertion of an alternate character, typically a precomposed character or a symbol. For instance, typing followed by and then will insert ñ. Compose keys are most popular on Linux and other systems using the X Window System, but software exists to implement them on Windows and macOS. History The Compose Character key was introduced by engineers at Digital Equipment Corporation (DEC) on the LK201 keyboard, available since 1983 with the VT220 terminal. The keyboard included an LED indicating that a Compose sequence is on-going. While the LK201 introduced the group of command keys between the alphanumerical block and the numerical keypad, and the "inverted T" arrangement of arrow keys, which have become standard, the compose key by contrast did not become a standard. In 1987, Sun Microsystems released the Sun4, the first ded ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Dead Key A dead key is a special kind of modifier key on a mechanical typewriter, or computer keyboard, that is typically used to attach a specific diacritic to a base letter. The dead key does not generate a (complete) character by itself, but modifies the character generated by the key struck immediately after. Thus, a dedicated key is not needed for each possible combination of a diacritic and a letter, but rather only one dead key for each diacritic is needed, in addition to the normal base letter keys. For example, if a keyboard has a dead key for the ''grave accent'' (`), the French character ''à'' can be generated by first pressing and then , whereas ''è'' can be generated by first pressing and then . Usually, the diacritic itself can be generated as an isolated character by pressing the dead key followed by ''space''; so a plain grave accent can be typed by pressing and then . Mechanical typewriters The dead key is mechanical in origin, and "dead" means without movement. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	List Of Precomposed Latin Characters In Unicode This is a list of precomposed Latin characters in Unicode. Unicode typefaces may be needed for these to display correctly. Letters with diacritics Digraphs and ligatures * Ǳ, ǲ, ǳ * Ǆ, ǅ, ǆ * ﬀ * ﬃ * ﬄ * ﬁ * ﬂ * Ĳ, ĳ * Ǉ, ǈ, ǉ * Ǌ, ǋ, ǌ * ﬆ * ﬅ Other characters A collection of precomposed Latin characters (mostly abbreviations of units of measurement) is also included in the CJK Compatibility and Enclosed CJK Letters and Months sections of Unicode, as are a set of precomposed Roman numerals; these characters are intended for use in East Asian languages and are not meant to be mixed with Latin languages. Several enclosed alphanumerics are also featured in Unicode. Some characters in the Letterlike Symbols block can be substituted with characters in the ASCII range. See also Latin script The Latin script, also known as Roman script, is an alphabetic writing system based on the letters of the classical Latin alphabet, derived fr ... [...More Info...] [...Related Items...] OR:* [Wikipedia] [Google] [Baidu]
picture info	Chinese Character Description Languages The Chinese character description languages are several proposed languages to most accurately and completely describe Chinese (or CJK) characters and information such as their list of components, list of strokes (basic and complex), their order, and the location of each of them on a background empty square. They are designed to overcome the inherent lack of information within a bitmap description. This enriched information can be used to identify variants of characters that are unified into one code point by Unicode and ISO/IEC 10646, as well as to provide an alternative form of representation for rare characters that do not yet have a standardized encoding in Unicode or ISO/IEC 10646. Many aim to work for Kaishu style and Song style, as well as to provide the character's internal structure which can be used for easier look-up of a character by indexing the character's internal make-up and cross-referencing among similar characters. CDL Character Description Language is a fon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]