Definition of "key signature" []

• Music The group of sharps or flats placed to the right of the clef on a staff to identify the key. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Members of the service may have their key certified by Four11 and placed on their server; a key signature from Four11 indicates that you have met their signing requirements."