
1) Group of flats 2) Notation after a clef
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https://www.crosswordclues.com/clue/key-signature

In musical notation, a key signature is a set of sharp or flat symbols placed together on the staff. Key signatures are generally written immediately after the clef at the beginning of a line of musical notation, although they can appear in other parts of a score, notably after a double barline. A key signature designates notes that are to be play...
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http://en.wikipedia.org/wiki/Key_signature
[cryptography] In cryptography, a key signature is the result of a third-party applying a cryptographic signature to a representation of a cryptographic key. This is usually done as a form of assurance or verification: If `Alice` has signed `Bob`s` key, it can serve as an assurance to another party, say `Eve`, that the key actually belongs ...
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http://en.wikipedia.org/wiki/Key_signature_(cryptography)

in musical notation, the arrangement of sharp or flat signs on particular lines and spaces of a musical staff to indicate that the corresponding ... [1 related articles]
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http://www.britannica.com/eb/a-z/k/25

The key signature of a piece of music tells the performer where the tonic, or 'home base,' is. Each key has its own key signature. (Check out the Links page to find sites where you can practice recognizing key signatures.)
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http://www.encyclo.co.uk/local/22289

[
n] - the sharps or flats that follow the clef and indicate the key
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http://www.webdictionary.co.uk/definition.php?query=key%20signature

the sharps or flats placed at the beginning of a composition or line of music denoting the scale on which the music is based.
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https://education.ket.org/resources/music-glossary/
noun the sharps or flats that follow the clef and indicate the key
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https://www.encyclo.co.uk/local/20974

In music, sharps or flats printed at the beginning of every line (or stave) of music after the clef. It tells a player what key the music is in. A key signature without any sharps or flats means the piece is in C major or A minor, or that the music is nontonal. As shown above, each key signature is shared by two keys: a major key and its relati...
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https://www.encyclo.co.uk/local/21221

The flats and sharps at the beginning of each staff line indicating the key of music the piece is to be played.
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https://www.encyclo.co.uk/local/21781

sharps or flats at the beginning of each staff to indicate the key of the composition.
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https://www.encyclo.co.uk/local/22288

(in notation) the group of sharps or flats placed after the clef to indicate the tonality of the music following.
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https://www.infoplease.com/dictionary/key-signature
No exact match found.