Writing system

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A writing system comprises a set of symbols, called a script, as well as the rules by which the script represents a particular language. The earliest writing was invented during the late 4th millennium BC. Throughout history, each writing system invented without prior knowledge of writing gradually evolved from a system of proto-writing that included a small number of ideograms, which were not fully capable of encoding spoken language, and lacked the ability to express a broad range of ideas.

Writing systems are generally classified according to how its symbols—called graphemes—generally relate to units of language. Phonetic writing systems, which include alphabets and syllabaries, use graphemes that correspond to sounds in the corresponding spoken language. Alphabets use graphemes called letters that correspond to spoken phonemes—with abjads only having letters for consonants, and pure alphabets having them for both consonants and vowels. In abugidas, graphemes correspond to spoken consonant–vowel pairs. Syllabaries use graphemes called syllabograms that represent spoken syllables or moras. By contrast, morphographic (or logographic) writing systems use graphemes that represent a language's units of meaning, such as words or morphemes. Alphabets typically use fewer than 100 symbols, while syllabaries and logographies may use hundreds or thousands respectively.

A writing system also includes any punctuation used to aid readers and encode additional meaning, including that which would be communicated in speech via qualities of rhythm, tone, pitch, accent, inflection, or intonation.

According to most contemporary definitions, writing is a visual and tactile notation representing language. The symbols used in writing correspond systematically to functional units of either a spoken or signed language. This definition excludes a broader class of symbolic markings, such as drawings and maps.^[a][3] A text is any instance of written material, including transcriptions of spoken material.^[4] The act of composing and recording a text may be referred to as writing,^[5] and the act of viewing and interpreting the text as reading.^[6]

The relationship between writing and language more broadly has been the subject of philosophical analysis as early as Aristotle (384–322 BC).^[7] While the use of language is universal across human societies, writing is not—having first emerged much more recently, and only having been independently invented in a handful of locations throughout history. While most spoken languages have not been written, all written languages have been predicated on an existing spoken language.^[8] When those with signed languages as their first language read writing associated with a spoken language, this functions as literacy in a second, acquired language.^[b][9] A single language (e.g. Hindustani) can be written using multiple writing systems, and a writing system can also represent multiple languages. For example, Chinese characters have been used to write multiple languages throughout the Sinosphere—including the Vietnamese language from at least the 13th century, until their replacement with the Latin-based Vietnamese alphabet in the 20th century.^[10]

In the first several decades of modern linguistics as a scientific discipline, linguists often characterized writing as merely the technology used to record speech—which was treated as being of paramount importance, for what was seen as the unique potential for its study to further the understanding of human cognition.^[11]

While certain core terminology is used throughout the study of writing systems, the precise interpretations of and definitions for concepts often vary depending on the theoretical model employed by the researcher.^[12]

A grapheme is the basic functional unit of a writing system. Graphemes are generally defined as minimally significant elements which, when taken together, comprise the set of symbols from which texts may be constructed.^[13] All writing systems require a set of defined graphemes, collectively called a script.^[14] The concept of the grapheme is similar to that of the phoneme used in the study of spoken languages. Likewise, as many sonically distinct phones may function as the same phoneme depending on speaker, dialect, and context, many visually distinct glyphs (or graphs) may be identified as the same grapheme. These variant glyphs are known as the allographs of a grapheme: For example, the lowercase letter ⟨a⟩ may be represented by the double-storey |a| and single-storey |ɑ| shapes,^[15] or others written in cursive, block, or printed styles. The choice of a particular allograph may be influenced by the medium used, the writing instrument used, the stylistic choice of the writer, the preceding and succeeding graphemes in the text, the time available for writing, the intended audience, and the largely unconscious features of an individual's handwriting.

Orthography (lit. 'correct writing') refers to the set of rules and conventions shared by a community, which assigns meaning to the ordering of and relationship between the graphemes. Particularly for alphabets, orthography includes the concept of spelling. For example, English orthography includes the uppercase and lowercase forms of the 26 letters of the Latin alphabet (with these graphemes corresponding to various phonemes), punctuation marks (mostly non-phonemic), and a handful of other symbols, such as numerals. Writing systems may be regarded as complete if they are able to represent all that may be expressed in the spoken language, while a partial writing system cannot represent the spoken language in its entirety.^[16]

Writing systems were preceded by proto-writing systems consisting of ideograms and early mnemonic symbols. The best-known examples are:

• The clay token system used for accounting purposes in Mesopotamia (c. 9000 BC)^[17]
• Proto-cuneiform (c. 3500 BC)^[18]
• Indus script (c. 3500 BC)
• Nsibidi script (before 500 AD)

Writing has been invented independently multiple times in human history. The first writing systems emerged during the Early Bronze Age, with the cuneiform writing system used to write Sumerian generally considered to be the earliest true writing, closely followed by the Egyptian hieroglyphs. It is generally agreed that the two systems were invented independently from one another; both evolved from proto-writing systems between 3400 and 3200 BC, with the earliest coherent texts dated c. 2600 BC. Chinese characters emerged independently in the Yellow River valley c. 1200 BC. There is no evidence of contact between China and the literate peoples of the Near East, and the Mesopotamian and Chinese approaches for representing aspects of sound and meaning are distinct.^[19][20][21] The Mesoamerican writing systems, including Olmec and the Maya script, were also invented independently.

The first known alphabetic writing appeared before 2000 BC, and was used to write a Semitic language spoken in the Sinai Peninsula. Most of the world's alphabets either descend directly from this Proto-Sinaitic script, or were directly inspired by its design. Descendants include the Phoenician alphabet (c. 1050 BC), and its child in the Greek alphabet (c. 800 BC).^[22][23] The Latin alphabet, which descended from the Greek alphabet, is by far the most common script used by writing systems.^[24]

Several approaches have been taken to classify writing systems, with the most common based on what unit of language is represented by each unit of writing. At the highest level, writing systems are either phonographic (lit. 'sound writing') when graphemes represent units of sound in a language, or morphographic (lit. 'form writing') when graphemes represent units of meaning, such as words or morphemes. The term logographic (lit. 'word writing') is used in various models either as a synonym for "morphographic", or as a specific subtype where the basic unit of meaning written is the word. Even with morphographic writing, there remains a correspondence between graphemes and the sounds of speech, but the pronunciation values of the units of meaning is not what is being encoded firstly by the writing system.^[25]

Many classifications are three-fold, with phonographic systems divided into syllabic and alphabetic (or segmental) systems. Syllabaries use symbols called syllabograms to represent syllables or moras. Alphabets use symbols called letters that correspond to spoken phonemes—or more technically to diaphonemes. Alphabets consist of three types: abjads only have letters for consonants, while pure alphabets have letters for both consonants and vowels. Abugidas use characters that correspond to consonant–vowel pairs. David Diringer proposed a five-fold classification of writing systems, comprising pictographic scripts, ideographic scripts, analytic transitional scripts, phonetic scripts, and alphabetic scripts.^[26]

A logogram is a character that represents a morpheme within a language. Chinese characters represent the only major logographic writing systems still in use: they have historically been used to write the varieties of Chinese, as well as Japanese, Korean, Vietnamese, and other languages of the Sinosphere. As each character represents a single unit of meaning, many different logograms are required to write all the words of a language. If the logograms do not adequately represent all meanings and words of a language, written language can be confusing or ambiguous to the reader.^[27]

Logograms are sometimes conflated with ideograms, symbols which graphically represent abstract ideas; most linguists now reject this characterization:^[28] Chinese characters are often semantic–phonetic compounds, which include a component related to the character's meaning, and a component that gives a hint for its pronunciation.

A syllabary is a set of written symbols that represent either syllables or moras—a unit of prosody that is often but not always a syllable in length.^[29] The graphemes used in syllabaries are called syllabograms. Syllabaries are best suited to languages with relatively simple syllable structure, since a different symbol is needed for every syllable. Japanese, for example, contains about 100 moras, which are represented by moraic hiragana. By contrast, English features complex syllable structures with a relatively large inventory of vowels and complex consonant clusters—making for a total of 15–16,000 distinct syllables. Some syllabaries have larger inventories: the Yi script contains 756 different symbols.^[30]

An alphabet is a set of letters, each of which generally represent one of the segmental phonemes in a spoken language. However, these correspondences are rarely uncomplicated, and spelling is often mediated by other factors than just which sounds are used by a speaker.^[31] The word alphabet is derived from alpha and beta, the names for the first two letters in the Greek alphabet. An abjad is an alphabet whose letters only represent the consonantal sounds of a language. They were the first alphabets to develop historically, with most that have been developed used to write Semitic languages, and originally deriving from the Proto-Sinaitic script. The morphology of Semitic languages is particularly suited to this approach, as the denotation of vowels is generally redundant. Optional markings for vowels may be used for some abjads, but are generally limited to applications like education. Many pure alphabets were derived from abjads through the addition of dedicated vowel letters, as with the derivation of the Greek alphabet from the Phoenician alphabet c. 800 BC. Abjad is the word for "alphabet" in Arabic and Malay: the term derives from the traditional order of the Arabic alphabet's letters 'alif, bā', jīm, dāl, though the word may have earlier roots in Phoenician or Ugaritic.

An abugida is an alphabetic writing system whose basic signs denote consonants with an inherent vowel and where consistent modifications of the basic sign indicate other following vowels than the inherent one.^[32] In an abugida, there may be a sign for k with no vowel, but also one for ka (if a is the inherent vowel), and ke is written by modifying the ka sign in a consistent way with how la would be modified to get le. In many abugidas, modification consists of the addition of a vowel sign; other possibilities include rotation of the basic sign, or addition of diacritics.

While true syllabaries have one symbol per syllable and no systematic visual similarity, the graphic similarity in most abugidas stems from their origins as abjads—with added symbols comprising markings for different vowel added onto a pre-existing base symbol. The largest single group of abugidas is the Brahmic family of scripts, however, which includes nearly all the scripts used in India and Southeast Asia. The name abugida is derived from the first four characters of an order of the Geʽez script used in some contexts. It was coined as a linguistic term by Peter T. Daniels (b. 1951), who borrowed it from the Ethiopian languages.^[33]

Originally proposed as a category by Geoffrey Sampson (b. 1944),^[34][35] a featural system uses symbols representing sub-phonetic elements—e.g. those traits that can be used to distinguish between and analyse a language's phonemes, such as their voicing or place of articulation. The only prominent example of a featural system is the hangul script used to write Korean, where featural symbols are combined into letters, which are in turn joined into syllabic blocks. Many scholars, including John DeFrancis (1911–2009), reject a characterization of hangul as a featural system—with arguments including that Korean writers do not themselves think in these terms when writing—or question the viability of Sampson's category altogether.^[36]

As hangul was consciously created by literate experts, Daniels characterizes it as a "sophisticated grammatogeny"^[37]—a writing system intentionally designed for a specific purpose, as opposed to having evolved gradually over time. Other grammatogenies include shorthands developed by professionals and constructed scripts created by hobbyists and creatives, like the Tengwar script designed by J. R. R. Tolkien to write the Elven languages he also constructed. Many of these feature advanced graphic designs corresponding to phonological properties. The basic unit of writing in these systems can map to anything from phonemes to words. It has been shown that even the Latin script has sub-character features.^[38]

In linear writing, which includes systems like the Latin alphabet and Chinese characters, glyphs are made up of lines or strokes. Linear writing is most common, but there are non-linear writing systems where glyphs consist of other types of marks, such as in cuneiform and Braille. Egyptian hieroglyphs and Maya script were often painted in linear outline form, but in formal contexts they were carved in bas-relief. The earliest examples of writing are linear: while cuneiform was not linear, its Sumerian ancestors were. Non-linear systems are not composed of lines, no matter what instrument is used to write them. Cuneiform was likely the earliest non-linear writing. Its glyphs were formed by pressing the end of a reed stylus into moist clay, not by tracing lines in the clay with the stylus as had been done previously. The result was a radical transformation of the appearance of the script.

Braille is a non-linear adaptation of the Latin alphabet that completely abandoned the Latin forms. The letters are composed of raised bumps on the writing substrate, which can be leather, stiff paper, plastic or metal. There are also transient non-linear adaptations of the Latin alphabet, including Morse code, the manual alphabets of various sign languages, and semaphore, in which flags or bars are positioned at prescribed angles. However, if "writing" is defined as a potentially permanent means of recording information, then these systems do not qualify as writing at all, since the symbols disappear as soon as they are used. Instead, these transient systems serve as signals.

Writing systems may be characterized by how text is graphically divided into lines, which are to be read in sequence:^[39]

Axis

Whether lines of text are laid out as horizontal rows or vertical columns

Lining

How each line is positioned relative to the one previous on the medium—whether above or below it on a horizontal axis, or to the left or right of it on a vertical axis

Directionality

How individual lines are read—whether starting from the left or right on a horizontal axis, or from the top or bottom on a vertical axis

For example, English and many other Western languages are written in horizontal rows that begin at the top of a page and end at the bottom, with each row read from left to right. Egyptian hieroglyphs were written either left to right or right to left, with the animal and human glyphs turned to face the beginning of the line. The early alphabet could be written in multiple directions:^[40] horizontally from side to side, or vertically. Prior to standardization, alphabetic writing could be either left-to-right (LTR) and right-to-left (RTL). It was most commonly written boustrophedonically: starting in one (horizontal) direction, then turning at the end of the line and reversing direction.

The right-to-left direction of the Phoenician alphabet initially stabilized after c. 800 BC.^[41] Left-to-right writing has an advantage that, since most people are right-handed,^[42][43] the hand does not interfere with text being written—which might not yet have dried—since the hand is to the right side of the pen. The Greek alphabet and its successors settled on a left-to-right pattern, from the top to the bottom of the page. Other scripts, such as Arabic and Hebrew, came to be written right-to-left. Scripts that historically incorporate Chinese characters have traditionally been written vertically in columns arranged from right to left, while a horizontal writing direction in rows from left to right became widely adopted only in the 20th century due to Western influence.

Several scripts used in the Philippines and Indonesia, such as Hanunoo, are traditionally written with lines moving away from the writer, from bottom to top, but are read horizontally left to right; however, Kulitan, another Philippine script, is written top-to-bottom in columns arranged right-to-left. Ogham is written bottom-to-top and read vertically, commonly on the corner of a stone. The ancient Libyco-Berber alphabet was also written from bottom to top.

• Calligraphy
• Defective script
• Digraphia
• Epigraphy
• Formal language
• ISO 15924
• Pasigraphy
• Penmanship
• Paleography
• Transcription (linguistics)
• X-SAMPA

• The World's Writing Systems – all 294 known writing systems, each with a typographic reference glyph and Unicode status