e/Eighth octave C

Information
has gloss	eng: The musical note C8 is the C two full octaves above soprano high C. The note is one octave above the top of common musical keyboards, but the highest note of an 88-key piano. The pitch vibrates at 4,186 Hz (the A note below middle C vibrates at 220 Hz in comparison).
lexicalization	eng: Eighth Octave C
instance of	(noun) a notation representing the pitch and duration of a musical sound; "the singer held the note too long" note, tone, musical note