Jisho

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Wikipedia definition
1. Soft signThe soft sign (Ь, ь), also known as (the front) yer′, is a letter of the Cyrillic script. In Old Church Slavonic, it represented a short (or "reduced") front vowel. As with its companion, the back yer ‹ъ›, the vowel phoneme it designated was later partly dropped and partly merged with other vowels. In the modern Slavic Cyrillic writing systems, it does not represent an individual sound, but rather indicates palatalization of the preceding consonant.
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