key signature
US /ˈkiː ˌsɪɡ.nə.tʃər/
UK /ˈkiː ˌsɪɡ.nə.tʃər/

1.
조표, 키 시그니처
any of several combinations of sharps or flats on a musical staff at the beginning of a composition, indicating the key in which the composition is written
:
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The pianist checked the key signature before starting the piece.
피아니스트는 곡을 시작하기 전에 조표를 확인했다.
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Changing the key signature alters the pitch of many notes.
조표를 변경하면 많은 음표의 음높이가 바뀐다.