Mora (linguistics) in the context of "Right-to-left script"

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 appeared during the late 4th millennium BC. Throughout history, each independently invented writing system gradually emerged from a system of proto-writing, where a small number of ideographs were used in a manner incapable of fully encoding language, and thus lacking the ability to express a broad range of ideas.

Writing systems are generally classified according to how their symbols, called graphemes, 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 generally correspond to spoken phonemes. They are typically divided into three sub-types: Pure alphabets use letters to represent both consonant and vowel sounds, abjads generally only use letters representing consonant sounds, and abugidas use letters representing consonant–vowel pairs. Syllabaries use graphemes called syllabograms that represent entire syllables or moras. By contrast, logographic (or morphographic) writing systems use graphemes that represent the units of meaning in a language, such as its words or morphemes. Alphabets typically use fewer than 100 distinct symbols, while syllabaries and logographies may use hundreds or thousands, respectively.

In the linguistic study of written languages, a syllabary is a set of written symbols that represent the syllables or (more frequently) morae which make up words.

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.

Syllabograms are graphemes used to write the syllables or morae of words. Syllabograms in syllabaries are analogous to letters in alphabets, which represent individual phonemes, or logograms in logographies, which represent morphemes.

Syllabograms in the Maya script most frequently take the form of V (vowel) or CV (consonant-vowel) syllables of which approximately 83 are known. CVC signs are present as well. Two modern well-known examples of syllabaries consisting mostly of CV syllabograms are the Japanese kana, used to represent the same sounds in different occasions. Syllabograms tend not to be used for languages with more complicated syllables: for example English phonotactics allows syllables as complex as CCCVCCCC (as in /ˈstrɛŋkθs/ strengths), generating many thousands of possible syllables and making the use of syllabograms cumbersome.

Isochrony is a linguistic analysis or hypothesis assuming that any spoken language's utterances are divisible into equal rhythmic portions of some kind. Under this assumption, languages are proposed to broadly fall into one of two categories based on rhythm or timing: syllable-timed or stress-timed languages (or, in some analyses, a third category: mora-timed languages). However, empirical studies have been unable to directly or fully support the hypothesis, so the concept remains controversial in linguistics. While isochrony may be a useful theoretical framework in some contexts, studies suggest that, at best, syllable structure in natural speech only has a somewhat-regular rhythm.

In linguistics, a segment is "any discrete unit that can be identified, either physically or auditorily, in the stream of speech". The term is most used in phonetics and phonology to refer to the smallest elements in a language, and this usage can be synonymous with the term phone.

In spoken languages, segments will typically be grouped into consonants and vowels, but the term can be applied to any minimal unit of a linear sequence meaningful to the given field of analysis, such as a mora or a syllable in prosodic phonology, a morpheme in morphology, or a chereme in sign language analysis.

Kana (仮名; Japanese pronunciation: [ka.na]) are syllabaries used to write Japanese phonological units, morae. In current usage, kana most commonly refers to hiragana and katakana. It can also refer to their ancestor magana (真仮名; lit. 'true kana'), which were Chinese characters used phonetically to transcribe Japanese (e.g. man'yōgana); and hentaigana, which are historical variants of the now-standard hiragana.

Katakana, with a few additions, are also used to write Ainu. A number of systems exist to write the Ryūkyūan languages, in particular Okinawan, in hiragana. Taiwanese kana were used in Taiwanese Hokkien as ruby text for Chinese characters in Taiwan when it was under Japanese rule.