The first byte of a Cyrillic character (like б ) is 0xD0 , which looks like Ð in Western sets. The second byte 0xB1 looks like ± . 🔍 How to Recover the Original Text

A browser or email client reads those bytes as if they are single-byte characters from a Western European set (ISO-8859-1).

The text in your subject line is a clear example of —a phenomenon where text appears as a garbled mess of characters because it was encoded in one system (likely UTF-8 or a legacy regional encoding like CP1251) and then incorrectly decoded using another (like Windows-1252 or Latin-1).