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"Ь" is a letter from the Cyrillic alphabet used in Russian and other Slavic languages that doesn't represent a sound on its own. Instead, it modifies the pronunciation of the letter before it, typically softening the consonant sound, which is why it's called the "soft sign."
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Soft sign, from Alexandre Benois' 1904 alphabet book. It shows prorub′ (ice-hole), v′yuga (snowstorm) and puzyr′ (bubble).
The soft sign (Ь ь; italics: Ь ь or Ь ь; italics: Ь ь) is a letter in the Cyrillic script that is used in various Slavic languages. In Old Church Slavonic, it represented a short or reduced front vowel. However, over time, the specific vowel sound it denoted was largely eliminated and merged with other vowel sounds.