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Diacritic

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A diacritic is a small glyph added to a letter or a basic character to change its meaning or sound.

Latin letter Ą̄́
Latin letter Ą̄́

The term comes from the Ancient Greek word *diakrinein*, which means "to distinguish." This name is perfect because diacritics help readers distinguish between different sounds, words, or meanings. While people often call these marks "accents," that term usually only refers to specific types like the acute, grave, or circumflex. Diacritics are versatile tools in writing. They can appear above a letter, below a letter, inside a letter, or even between two separate letters.

In the Latin script, the primary mechanism of a diacritic is to modify the sound-value of a letter. For example, an acute accent or a grave accent can signal that a vowel should be pronounced differently than usual. This prevents a vowel from being reduced to a neutral sound or becoming silent. In English, we occasionally use a mark called a diaeresis to prevent mispronunciation. In the word "coöperate," the diaeresis tells the reader to pronounce the two "o" sounds separately. Without this mark, the letter sequence might be misinterpreted. Most other diacritics used in English are borrowed from languages like French to preserve original spellings, such as the cedilla in "façade" or the circumflex in "hôtel."

Germanic umlaut on keyboard
Germanic umlaut on keyboard

There are many distinct types of diacritics categorized by their shape and function. Accents include the acute (´), grave (`), circumflex (^), caron or wedge (ˇ), and double acute (˝). Other shapes include the tilde (~), the macron (a horizontal line), and the breve (a small curve). Some marks use dots, such as the overdot (˙), the underdot (.), or the interpunct (·) used in Catalan. There are even complex marks like the ogonek, which is a small hook attached to the bottom of a letter. Some systems use double marks, such as a double circumflex or a double diaeresis, to convey very specific linguistic information.

History shows that even the simplest marks have evolved over centuries. A notable example is the "tittle," which is the small dot above the lowercase letter "i." In the 11th century, this dot appeared to help distinguish the letter "i" from the vertical strokes, or "minims," of adjacent letters like "m," "n," or "u." By the 15th century, many accents had developed into long, flowing flourishes. However, when Roman type became common, these marks were simplified into the round, compact shapes we recognize today.

Diacritics serve vital roles in various global writing systems, often with specific numbers of functions. In the Arabic script, vowel points serve two main purposes: they act as phonetic guides and indicate grammatical inflection. These points can show the presence of short vowels or their complete absence. In Hebrew, the niqqud system uses dots and lines to indicate vowels that the basic alphabet does not show.

Example of biblical Hebrew trope
Example of biblical Hebrew trope

Other marks, known as cantillation marks, are used to indicate prosody, or the rhythm and melody of the text. In Vietnamese and the Hanyu Pinyin system for Mandarin, diacritics are essential for marking tones, which change the meaning of a syllable.

Different cultures apply these marks in surprising ways. In the Korean Hangul system, marks called Bangjeom were used to indicate pitch accents.

Hunmin jeong-eum
Hunmin jeong-eum

In Indic scripts like Devanagari, diacritics called matras are used to combine vowels with consonant letters.

Devanagari matras
Devanagari matras

In some languages, like the Wali language of Ghana, an apostrophe might appear at the very beginning of a word to change the quality of all vowels within that word. This demonstrates that a diacritic does not always have to sit directly next to the letter it modifies.

Finally, diacritics connect to broader concepts in linguistics and computer science, such as orthography and collation. Orthography is the study of spelling systems, and collation is the method of ordering words. In some languages, a letter with a diacritic is treated as a completely new, distinct letter. In others, it is treated as a combination of a base letter and a mark. This can even affect how libraries organize books. For example, in the past, the German spelling "sch" was sometimes treated as a single distinct letter in the card catalogs of Vienna public libraries.

Spanish orthography
Spanish orthography
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🖼️ Images & Media (6)
File:Latin letter Ą̄́.svg
Latin letter Ą̄́.svg
File:Example of biblical Hebrew trope.svg
Example of biblical Hebrew trope.svg
File:Hunmin jeong-eum.jpg
Hunmin jeong-eum.jpg
File:Devanagari matras.svg
Devanagari matras.svg
File:Germanic umlaut on keyboard.jpg
Germanic umlaut on keyboard.jpg
File:Spanish orthography.jpg
Spanish orthography.jpg
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