KOI8
KOI8 (or KOI-8; GOST 19768-74) is a family of 8-bit character encodings primarily for Cyrillic alphabets. Character codes 32-126 are identical with the corresponding ASCII characters. Cyrillic characters are ordered in phonetic correspondence to ASCII characters in the bottom half of the code table, not in native alphabetical order. The most widely used of these encodings is the Russian KOI8-R.
The KOI8 encodings have letters in an order designed to maximize legibility if the 8th bit is stripped; the ASCII characters at the same position are the ones most similar to the character at the high-bit position. This means that the sorting order for Cyrillic (or other alphabets in the few KOI8 encodings for non-Cyrillic scripts) doesn't match the actual normal sorting order for the languages using those alphabets.
