Greek alphabet
The Greek alphabet is the set of letters used to write the Greek language. It began around 800 BC, growing out of the Phoenician alphabet. Unlike many earlier scripts, it was designed to represent both vowels and consonants, making it an early true alphabet.
Early Greek writing varied a lot from place to place. By the end of the 4th century BC, the Ionic alphabet with 24 letters, arranged in the order alpha to omega, became standard across the Greek-speaking world. This 24-letter set is the one still used today for writing Greek.
Uppercase and lowercase forms did not always exist. In ancient times, people used only uppercase (capital) letters. Lowercase forms were developed later, during the Byzantine era, from the cursive handwriting of the time. In modern printing, uppercase letters come from the old capital shapes, and lowercase letters come from the handwriting styles that followed.
Directionally, Greek was not fixed at first. It could be written right-to-left or left-to-right, and some lines used a boustrophedon style (like an ox turning in the field). By classical times, Greek settled on left-to-right writing.
Names of the letters mostly come from the Phoenician alphabet. For example, the names alpha, beta, gamma trace back to Phoenician words. Over time, the sounds of Greek changed. For instance, what was once /b/ in Ancient Greek became /v/ in Modern Greek (so Beta is pronounced “vita”). Some letters kept their historical names even as their sounds shifted, which can be surprising to learners.
Vowels were added early in Greek history when the alphabet was adapted from Phoenician. This makes Greek one of the first alphabets to systematically write both vowels and consonants. Because of sound changes over centuries, the relationship between letters and sounds in Ancient Greek is not exactly the same as in Modern Greek. In particular, several vowel sounds merged, so Modern Greek has fewer distinct vowel sounds than Ancient Greek.
Diacritics, the little marks used on vowels, have a long history. Ancient Greek used a complex system called polytonic orthography to show pitch and stress. In 1982, Modern Greek adopted a simpler monotonic orthography with a single accent mark (the tonos) to show stress and, at times, a diaeresis to distinguish certain vowel combinations. The diacritic system was introduced by Aristophanes of Byzantium in the 3rd century BC, who also helped develop how texts were divided into lines.
Some letters and combinations have special roles beyond writing words. A few ancient letters (digamma, koppa, sampi) lasted on as numerals rather than sounds in the Greek numeral system, used to count 1–9, tens, and hundreds with a small stroke (keraia) to mark numerals. Greek letters also appear in science and mathematics as symbols (for example, alpha, beta, pi, sigma) and in naming stars, constellations, and many scientific concepts.
Greek influenced many other scripts. The Greek alphabet inspired the Latin, Cyrillic, Coptic, and other alphabets that developed later, and its letters appear in a wide range of symbols used in mathematics, physics, and engineering today.
In computing, there are two main Greek-related Unicode blocks. The “Greek and Coptic” block (U+0370 to U+03FF) covers modern Greek and many archaic letters. The “Greek Extended” block (U+1F00 to U+1FFF) covers polytonic forms used in classical and scholarly text. For practical text, many systems also support ISO 8859-7, which covers monotonic Greek, alongside Unicode.
Greek letters have several practical uses today:
- They name chapters and sections in books (using the older numeral system) and in some academic references.
- They are widely used as symbols in math, science, and engineering.
- They appear in the naming of hurricanes (historically) and in more recent health contexts (the WHO and other groups sometimes use Greek letters to label variants to avoid stigma).
Greek lives on not only as a language but as a rich source of symbols, traditions, and history reflected in writing, science, and everyday life.
This page was last edited on 3 February 2026, at 06:04 (CET).