Glossary

A writing system in which each symbol represents a consonant; vowels are either omitted entirely or indicated by optional diacritical marks added above or below the base letter. Arabic and Hebrew are the most widely used abjads. The term was coined by the linguist Peter Daniels in 1990, drawing on the Arabic letter names alif, bāʾ, jīm, dāl.

A writing system in which each base symbol represents a consonant with an inherent (default) vowel; other vowels are indicated by modifying the base symbol with attached diacritics, subscript forms, or surrounding marks. The inherent vowel is suppressed by a special killer mark (e.g. the virama in Indic scripts). Devanagari, Bengali, Tibetan, and Ethiopic are well-known abugidas. The name comes from the first four letters of the Ethiopic script.

A writing system in which separate symbols (letters) represent both consonants and vowels individually, providing a close mapping to the phonemic inventory of the language. The Greek alphabet — the first writing system to systematically represent vowels with dedicated letters — is the ancestor of Latin, Cyrillic, Armenian, Coptic, and Gothic scripts. The word 'alphabet' comes from the first two Greek letters, alpha and beta.

A writing system in which the shapes of symbols are deliberately and systematically designed to encode phonetic features such as place or manner of articulation. Hangul (Korean) is the best-known example: its consonant letters are iconic diagrams of the mouth position used to produce each sound, and related consonants share a similar base shape. Tengwar and Visible Speech are other featural systems.

A writing system in which each symbol represents a word or morpheme rather than a phonetic unit. Chinese characters (Hanzi), Japanese Kanji, and Korean Hanja are the primary logographic systems still in wide use. Most logographic systems also contain phonetic components (semantic-phonetic compound characters) that hint at pronunciation. True pure logographies — where every symbol is purely semantic — are rare.

A writing system using pictures or pictograms to represent objects, ideas, or events directly rather than through sound. Pictographic systems are among the earliest forms of written communication: early Sumerian clay tablets (c. 3400 BCE) began as pictographic before evolving into cuneiform syllabic writing. Modern emoji are sometimes described as pictographic. Most ancient pictographic systems evolved toward phonetic representation over time.

A writing system in which each symbol represents a syllable — typically a consonant–vowel pair or a standalone vowel — rather than a single phoneme. Japanese kana (Hiragana and Katakana) and the Cherokee script are syllabaries. Unlike an abugida, each syllable shape is completely independent with no shared base form between related syllables. Linear B (Mycenaean Greek) was an ancient syllabary.

A script that distinguishes between two letterform cases: uppercase (majuscule) and lowercase (minuscule) forms of the same letter. Uppercase letters developed in ancient Rome for monumental inscriptions; lowercase forms evolved in medieval manuscript writing for speed. Latin, Greek, Cyrillic, and Armenian are bicameral. Arabic, Hebrew, Devanagari, and most other scripts are unicameral (single-case).

A writing direction in which alternate lines run in opposite directions — one line left-to-right, the next right-to-left — like the back-and-forth path of an ox plowing a field (Greek: bous 'ox' + strephein 'to turn'). Found in early Greek inscriptions, some Etruscan texts, and the ancient Safaitic script. No modern script uses boustrophedon as its standard direction.

A style of writing in which letters or characters are joined together in a flowing, connected stroke rather than written discretely. Some scripts are inherently and obligatorily cursive — Arabic and Syriac letters connect within words and cannot be written in disconnected form. Other scripts (Latin, Greek) have separate print and cursive variants. Cursive forms often develop to increase writing speed.

A mark added above, below, or through a base letter to alter its phonetic value, indicate stress or tone, or distinguish between otherwise identical words. Common diacritics include acute accents (é), grave accents (à), circumflexes (â), umlauts (ü), cedillas (ç), and tildes (ñ). In abugidas, vowel markers are a systematic form of diacritic applied to consonant base forms.

The smallest functional unit of a writing system that distinguishes meaning — a letter, character, or symbol with a distinct value within the script. A grapheme is the written equivalent of a phoneme: it represents a contrastive unit. For example, ‹ch› in English is a single grapheme (representing one sound) even though it is spelled with two letters. ‹a› and ‹A› are two glyphs of the same grapheme.

The specific visual form — shape, design, rendering — of a grapheme in a particular font, style, or medium. A single grapheme can have many glyphs: the letter 'a' appears as a single-story (ɑ) or double-story (a) form depending on the typeface. A glyph is the rendered, visible image; the grapheme is the abstract linguistic unit it represents. Unicode assigns code points to graphemes, not to glyphs.

A single glyph formed by joining two or more graphemes into one connected form. The fi and fl ligatures in Latin typography are typographic conveniences that prevent clashing ascenders. In Arabic, many letter combinations produce obligatory ligatures (e.g. lām-alif). The German ß (Eszett) originated as a ligature of the long-s (ſ) and z. Ligatures can be purely visual or phonologically significant.

The standardized system of conventions governing the written representation of a language, including spelling, punctuation, capitalization, and hyphenation. Orthography specifies which graphemes represent which sounds and how words are visually segmented. A single script may underlie hundreds of distinct orthographies: the Latin script serves as the base for English, French, Turkish, Vietnamese, and many other languages, each with different spelling rules.

The addition of vowel diacritical marks to a script that normally omits them. Arabic (an abjad) can be written with or without vowel marks called tashkeel; Hebrew uses optional niqqud. Fully vocalized text is used in the Quran, the Hebrew Bible, children's books, and language-learning materials. Without vocalization, readers rely on context and lexical knowledge to supply the correct vowels.

Text containing a mix of left-to-right and right-to-left scripts within a single line or document. Unicode defines the Bidirectional Algorithm (UAX #9) to specify the correct display order for such mixed text. Common in documents that embed Arabic or Hebrew quotations within Latin prose, or in software interfaces that must handle both LTR and RTL input simultaneously.

A writing direction in which characters are written, read, and rendered from left to right. Lines stack from top to bottom. LTR is used by Latin, Cyrillic, Greek, Devanagari, Thai, and the majority of the world's scripts. In Unicode, the default directionality for most scripts is strongly LTR.

A writing direction in which characters are written, read, and rendered from right to left. Line and paragraph flow also proceeds from right to left in RTL documents, so a page's first line is at the top right. RTL scripts include Arabic, Hebrew, Thaana (Maldivian), N'Ko, and Adlam. Arabic and Hebrew digits, however, are displayed left-to-right within RTL text.

A writing direction in which characters are arranged vertically in columns rather than horizontal rows. East Asian scripts — Chinese, Japanese, Korean — traditionally run top-to-bottom in columns ordered right-to-left (the traditional model). Mongolian runs top-to-bottom in columns ordered left-to-right. Vertical writing remains standard in East Asian publishing for literature, newspapers, and formal documents.

The first of Unicode's 17 planes, containing code points U+0000 to U+FFFF (65,536 positions). The BMP covers virtually all modern scripts, common symbols, and punctuation. Characters outside the BMP — supplementary characters in Planes 1–16 — include historic scripts, musical notation, mathematical symbols, and emoji. In UTF-16, supplementary characters require two code units called a surrogate pair.

An integer value in the Unicode standard assigned to a specific character, written in the form U+XXXX (e.g. U+0041 = Latin capital letter A, U+0627 = Arabic letter Alef). Unicode defines 1,114,112 possible code points (U+0000 to U+10FFFF) across 17 planes, of which approximately 155,000 are currently assigned to characters (Unicode 16.0, September 2024).

The international standard (ISO/IEC 10646) for the consistent encoding, representation, and handling of text across the world's writing systems. Maintained by the Unicode Consortium, it assigns a unique code point to every character in every script — currently over 155,000 characters covering 168 scripts (Unicode 16.0). Unicode also specifies algorithms for bidirectional text, normalization, collation, and line breaking.

A named, contiguous range of Unicode code points allocated to a particular script or group of related characters. Blocks vary widely in size: Basic Latin occupies just 128 code points (U+0000–U+007F), while the CJK Unified Ideographs block holds 20,902 (U+4E00–U+9FFF). A single ISO 15924 script may span multiple Unicode blocks, and some blocks contain characters from more than one script.

The dominant Unicode encoding format, using 1 to 4 bytes per character. U+0000–U+007F (ASCII range) encode as a single byte, making UTF-8 fully backward-compatible with ASCII. Subsequent byte counts grow with code point magnitude: European scripts typically use 2 bytes, most Asian scripts 3 bytes, and supplementary characters 4 bytes. UTF-8 is mandated by HTML5 and accounts for over 98% of web pages.

The international standard that assigns four-letter alphabetic codes and three-digit numeric codes to writing systems. Examples: Latn (215) for Latin, Arab (160) for Arabic, Deva (315) for Devanagari. The standard is maintained by the Unicode Consortium as the Registration Authority on behalf of ISO. New script codes are added as scripts are encoded in Unicode or submitted by national bodies. Scriptologue uses ISO 15924 codes throughout.

The international standard for language codes, providing a unique three-letter identifier for more than 8,000 individual languages, macrolanguages, and special-purpose codes. Examples: eng (English), ara (Arabic), zho (Chinese), jpn (Japanese). Maintained by SIL International as the Registration Authority. Codes are assigned to individual languages, not dialects, and retired codes are preserved to avoid reuse.

Special ISO 15924 codes reserved for administrative or structural purposes rather than actual writing systems. The seven meta-codes are: Zinh (inherited — characters that inherit their script from context), Zmth (mathematical notation), Zsye (emoji), Zsym (symbols not belonging to a specific script), Zxxx (unwritten languages and sign languages), Zyyy (undetermined script), and Zzzz (uncoded or unknown script). Scriptologue excludes meta-codes from most script counts.

A writing system used exclusively in the ancient world, with no surviving community of native users and typically no known direct descendants still in everyday use. Examples include Egyptian hieroglyphs, Linear B (Mycenaean Greek), Cuneiform (Sumerian/Akkadian), and Phoenician. Some ancient scripts have been partially or fully deciphered; others (e.g. Proto-Elamite, Linear A) remain undeciphered.

In GlotScript, AUXILIARY means single-source attestation of a language–script relationship. It does not establish secondary, religious, historical or minority-community usage. The usage context is unknown unless supported by a separate source.

A writing system deliberately created by a known individual or group, rather than evolving organically over generations. Examples: Hangul (created by King Sejong of Korea in 1443), the Cree syllabics (James Evans, 1840), Shavian (designed for English phonemic spelling), and Tengwar (J.R.R. Tolkien's fictional script). Constructed scripts range from practical reforms to artistic inventions for fictional languages.

A script that was once actively used to write a living language but is no longer in everyday use, having been replaced by another script or fallen out of use as its language ceased to be spoken. Historical scripts are distinct from ancient scripts in that they were used in the historical period (broadly, after 600 CE). Examples: Gothic script (replaced by Fraktur and then Latin), Kharosthi, Palmyrene.

A writing system currently in active everyday use by a living community of writers. Most living scripts are associated with living languages, though some (Latin) also serve classical and liturgical purposes. A script can be considered living even if the community is small, provided it is actively used for contemporary communication rather than solely for ceremonial or scholarly purposes.

GlotScript MAIN or CORE means multiple-source attestation: at least two source groups support a language–script relationship. It does not establish everyday prevalence, official status, current use or a particular orthography. Multiple MAIN scripts are not ranked by usage.

A broad geographic or typological grouping of script families sharing common ancestry, regional origin, or historical connection. Scriptologue organizes the world's writing systems into 10 clusters: Brahmic, Semitic, East Asian, European, African, Central Asian, Ancient, Americas, Constructed, and Notation. Clusters are an editorial classification, not a formal standard.

A group of writing systems that share a demonstrable common ancestor or are closely related by design, derivation, or convention. The Brahmic family descends from the ancient Brahmi script (c. 3rd century BCE) and includes Devanagari, Bengali, Tamil, Tibetan, and dozens of others. The Semitic family, descending from Proto-Sinaitic (c. 1850 BCE), includes Arabic, Hebrew, Syriac, and Ethiopic.

A language with no living native speakers and no community of second-language speakers actively using it for communication. An extinct language may still have written records and be studied academically. Latin is sometimes described as extinct as a native first language but persists as a learned classical and liturgical language. Sumerian and Ancient Egyptian are unambiguously extinct.

A language used as a common means of communication between speakers who share no native language. Latin served as the lingua franca of medieval European scholarship and the Church; classical Arabic is the lingua franca of Islamic scholarship; English is today's primary global lingua franca for science, aviation, diplomacy, and the internet. The phrase itself is Italian, referring to the Frankish trade language used in the medieval Mediterranean.

An ISO 639-3 classification for a cluster of closely related individual languages that are treated as a single language in some contexts but are linguistically distinct. Arabic (ara) is a macrolanguage encompassing dozens of regional spoken varieties (Egyptian, Moroccan, Gulf, etc.); Chinese (zho) encompasses Mandarin, Cantonese, Hokkien, and others. Each individual language within a macrolanguage also has its own ISO 639-3 code.

The smallest unit of sound in a spoken language that can distinguish one word from another. The English words 'cat', 'bat', and 'hat' differ in their initial phoneme (/k/, /b/, /h/). Writing systems that represent individual sounds (alphabets, abjads, abugidas) map their graphemes — imperfectly, in most cases — to phonemes. A language's phoneme inventory typically ranges from about 11 (Hawaiian) to 144 (ǂKhomani San).