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C-sharp major (uncountable)

(music) A key with the notes C♯, D♯, E♯, F♯, G♯, A♯, and B♯, the key signature of which has seven sharps:

${\key cis \major cis' dis' eis' fis' gis' ais' bis' cis''2}$
(music) The major chord with the notes C♯, E♯, and G♯:

<img loading="lazy" src="//upload.wikimedia.org/score/9/v/9vk9kuspj8vpduc8zafqajysd327rgd/9vk9kusp.png" width="127" height="59" alt="1">

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