section_path: Computer encoding/Unicode
section_name: Unicode
paragraph_text: Unicode
  
  As of Unicode version 15.1, Cyrillic letters, including national and historical alphabets, are encoded across several blocks:
  
  The characters in the range U+0400 to U+045F are essentially the characters from ISO 8859-5 moved upward by 864 positions. The characters in the range U+0460 to U+0489 are historic letters, not used now. The characters in the range U+048A to U+052F are additional letters for various languages that are written with Cyrillic script.
  
  Unicode as a general rule does not include accented Cyrillic letters. A few exceptions include:
  
  To indicate stressed or long vowels, combining diacritical marks can be used after the respective letter (for example, U+0301 ◌ ́ COMBINING ACUTE ACCENT: е́ у́ э́ etc.).
  
  Some languages, including Church Slavonic, are still not fully supported.
  
  Unicode 5.1, released on 4 April 2008, introduces major changes to the Cyrillic blocks. Revisions to the existing Cyrillic blocks, and the addition of Cyrillic Extended A (2DE0... 2DFF) and Cyrillic Extended B (A640... A69F), significantly improve support for the early Cyrillic alphabet, Abkhaz, Aleut, Chuvash, Kurdish, and Moksha.