musical sign (accidental) lowering the pitch of a note by one chromatic semitone (factor 2^(1/12))
via Wikipedia infobox
In music, flat means lower in pitch. The flat symbol, ♭, indicates that the note to which it is applied is played one chromatic semitone lower. The opposite of flat is sharp, indicating a raising of pitch.
The flat symbol (♭) appears in key signatures to indicate which notes are flat throughout a section of music, and also in front of individual notes as an accidental, indicating that the note is flat until the next bar line.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).