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In the Linguistics study of Written language, a syllabary is a set of grapheme that represent the or (more frequently) morae which make up .
A symbol in a syllabary, called a syllabogram, typically represents an (optional) consonant sound (simple onset) followed by a vowel sound (nucleus)—that is, a CV (consonant+vowel) or V syllable—but other phonographic mappings, such as CVC, CV- tone, and C (normally nasals at the end of syllables), are also found in syllabaries.
True syllabograms are those that encompass all parts of a syllable, i.e., initial onset, medial nucleus and final coda, but since onset and coda are optional in at least some languages, there are middle (nucleus), start (onset-nucleus), end (nucleus-coda) and full (onset-nucleus-coda) true syllabograms. Most syllabaries only feature one or two kinds of syllabograms and form other syllables by graphemic rules.
Syllabograms, hence syllabaries, are pure, analytic or arbitrary if they do not share graphic similarities that correspond to phonic similarities, e.g. the symbol for ka does not resemble in any predictable way the symbol for ki, nor the symbol for a. Otherwise, they are synthetic, if they vary by onset, rime, nucleus or coda, or systematic, if they vary by all of them. Some scholars, e.g., Daniels,Peter Daniels, 1996. "The Study of Writing Systems", p. 4. In: Daniels & Bright, The World's Writing Systems. reserve the general term for analytic syllabaries and invent other terms (abugida, abjad) as necessary.
Chinese characters, the cuneiform script used for Sumerian, Akkadian and other languages, and the former Maya script are largely syllabic in nature, although based on . They are therefore sometimes referred to as logosyllabic.
The contemporary Japanese language uses two syllabaries together called kana (in addition to the non-syllabic systems kanji and romaji), namely hiragana and katakana, which were developed around 700. Because Japanese uses mainly CV (consonant + vowel) syllables, a syllabary is well suited to write the language. As in many syllabaries, vowel sequences and final consonants are written with separate glyphs, so that both atta and kaita are written with three kana: あった ( a-t-ta) and かいた ( ka-i-ta). It is therefore more correctly called a moraic writing system, with syllables consisting of two moras corresponding to two kana symbols.
Languages that use syllabaries today tend to have simple phonotactics, with a predominance of monomoraic (CV) syllables. For example, the modern Yi script is used to write languages that have no diphthongs or syllable codas; unusually among syllabaries, there is a separate glyph for every consonant-vowel-tone combination (CVT) in the language (apart from one tone which is indicated with a diacritic).
Few syllabaries have glyphs for syllables that are not monomoraic, and those that once did have simplified over time to eliminate that complexity. For example, the Vai syllabary originally had separate glyphs for syllables ending in a coda (doŋ), a long vowel (soo), or a diphthong (bai), though not enough glyphs to distinguish all CV combinations (some distinctions were ignored). The modern script has been expanded to cover all moras, but at the same time reduced to exclude all other syllables. Bimoraic syllables are now written with two letters, as in Japanese: diphthongs are written with the help of V or hV glyphs, and the nasal codas will be written with the glyph for ŋ, which can form a syllable of its own in Vai.
In Linear B, which was used to transcribe Mycenaean Greek, a language with complex syllables, complex consonant onsets were either written with two glyphs or simplified to one, while codas were generally ignored, e.g., ko-no-so for Κνωσός Knossos, pe-ma for σπέρμα sperma.
The Cherokee syllabary generally uses dummy vowels for coda consonants, but also has a segmental grapheme for /s/, which can be used both as a coda and in an initial /sC/ consonant cluster.
In the 19th century these systems were called syllabics, a term which has survived in the name of Canadian Aboriginal syllabics (also an abugida).
In a true syllabary there may be graphic similarity between characters that share a common consonant or vowel sound, but it is not systematic or at all regular. For example, the characters for ka ke ko in Japanese hiragana – か け こ – have no similarity to indicate their common /k/ sound. Compare this with Devanagari script, an abugida, where the characters for ka ke ko are क के को respectively.
The Korean language script Hangul has been described as a syllabic alphabet as it combines the features of alphabetic and syllabic writing systems. Korean letters are written in syllabic blocks with the alphabetic letters arranged in two dimensions. For example, Seoul is written as 서울, not ㅅㅓㅇㅜㄹ.
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