Ka (uppercase К, lowercase к) is a basic letter of the Cyrillic alphabet typically used to represent the voiceless velar plosive /k/ — the same sound as English k in "cat." It appears early in most Cyrillic orders (commonly tenth) and is visually identical to the Latin K in many typefaces, although its role, name and behavior are specific to Cyrillic orthographies.

History and origin

The letter was adopted from the Greek kappa when the early Cyrillic script was created to write Slavic languages. Old Church Slavonic and early Cyrillic traditions assigned syllabic names to letters; the form and sound of Ka have remained relatively stable since its introduction. Over time the character was adapted to local handwriting and print styles across eastern and southern Slavic regions.

Phonetics and orthographic behavior

In most languages that use Cyrillic, Ka represents /k/. Before front vowels or a soft sign in languages like Russian and Ukrainian, it may be palatalized to a softer variant transcribed as /kʲ/. It commonly appears in words such as кот (cat), книга (book) and кино (cinema). When transliterated into Latin scripts, Ka is usually rendered as the letter "k."

Forms, variants and digital encoding

The printed uppercase and lowercase forms are К and к. Handwritten, italic or regional typefaces sometimes produce slightly different strokes for the small letter, but the basic shape remains recognizable. The Cyrillic Ka is encoded in modern character sets and Unicode as part of the standard Cyrillic block and is distinct from Latin and Greek characters even when the glyphs look alike.

  • Languages: Used across Russian, Ukrainian, Belarusian, Bulgarian, Serbian (Cyrillic), Macedonian and others.
  • Transliteration: Typically transcribed as k in Latin-based systems.
  • Lookalikes and security: Because it resembles Latin K, it can be a visual homoglyph; care is required in type-sensitive contexts and internationalized text.

Although Ka is one of the most straightforward Cyrillic letters phonetically, its interactions with palatalization, orthographic rules and regional typographic practice make it a small but important element of Slavic writing systems. For more on its Greek predecessor see kappa and for comparisons with the Latin alphabet see Latin K.