Overview

The letter known as Short I, written Й (uppercase) and й (lowercase), is a character of the Cyrillic script formed by adding a breve to the letter И. It commonly denotes a consonant glide, the palatal approximant /j/ (the sound of English y in "yes"), and is distinct from the vowel value usually associated with И. In modern orthographies the sign functions as an independent letter in many alphabets, marking glides, diphthongs, or consonantal combinations.

Form and pronunciation

Visually, Й is identical to И except for the small curved diacritic (the breve) placed above the character. Pronunciation varies by language and position: in word-initial position it often represents a consonantal onset as in Russian май (maj, "May") or йога (joga, "yoga"); between vowels it can form part of diphthong-like sequences; and in some contexts it indicates a palatalized quality on a preceding consonant. The letter contrasts with И, which typically represents the vowel /i/.

Й appears in the alphabets of several East and South Slavic languages as well as in other languages that have used Cyrillic orthographies. It is present in the Russian alphabet (often called И краткое, "short I"), in Ukrainian (commonly called йот or Ий), in Bulgarian (И кратко) and in Belarusian. In these systems the letter is treated as a separate grapheme used to represent the glide /j/ and to form syllable nuclei and clusters with vowels.

Alternative letters and regional variants

Not all Cyrillic-based orthographies use the breve-marked form to indicate /j/. Several languages instead use the Cyrillic letter Ј for this sound. For example, the standard orthographies of Serbian and Macedonian employ Ј rather than Й. In some non-Slavic languages that have used Cyrillic historically or in particular periods, such as Azeri, different conventions have existed; usage can vary with historical orthographic reforms and the influence of other scripts.

History and typographical notes

The breve-marked form arose in manuscript and early printed traditions as a practical means to distinguish the semivowel from the vowel И. Over time the form became conventionalized and was incorporated into national alphabets and typefaces. In contemporary digital text the uppercase and lowercase forms are encoded as separate characters so they participate in sorting, casing, and other text-processing operations like independent letters.

Orthographic behaviour and transliteration

Orthographic behaviour depends on language-specific rules. In many languages Й is placed adjacent to И in alphabetic order or otherwise grouped with similar letters. Transliteration into Latin script varies by system: the letter is commonly rendered as y (as in Russian май → maj/may) or as j in scholarly and some national conventions. When learning Cyrillic alphabets, recognizing the breve is important because it changes the phonetic function of the base letter from vowel to consonant.

Examples and learning notes

  • Russian: мой (moy) — final й denotes a glide; compare ми where И is the vowel.
  • Ukrainian: й appears in common words and separates vowel sequences or marks consonant onsets.
  • Bulgarian and Belarusian: similar uses to mark /j/ and to form diphthongs or glide+vowel clusters.
  • Serbian and Macedonian: use the letter Ј instead of Й in their orthographies.

Understanding the role of Й helps with pronunciation, syllabification, and correct transliteration. For further reading on related letters and national alphabets, see entries for Russian, Ukrainian, Bulgarian, Belarusian, Serbian, Macedonian and historical notes on Azeri usage.