Flat
Music
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In music, flat means lower in pitch. It may either be used generically, meaning any lowering of pitch, or refer to a particular size: lowering pitch by a chromatic semitone. A flat is the opposite of a sharp which raises pitch by the same amount... Wikipedia
Music symbol: (♭)
Different from: U+0062 b LATIN SMALL LETTER B
In Unicode: U+266D ♭ MUSIC FLAT SIGN (♭)
See also: U+1D12B MUSICAL SYMBOL DOUBLE FLAT; U+266F ♯ MUSIC SHARP SIGN