
1) Church-music symbol 2) Gregorian chant note 3) Medieval musical notation 4) Musical notational sign 5) Old musical staff notation 6) Old musical symbol
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https://www.crosswordclues.com/clue/neume

A neume (m; spelled neum in, for instance, the Solesmes publications in English) is the basic element of Western and Eastern systems of musical notation prior to the invention of five-line staff notation. The word is a Middle English corruption of the Greek word for breath (πνεῦμα pneuma). The earliest neumes were inflective marks which ind...
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http://en.wikipedia.org/wiki/Neume

in musical notation, a sign for one or a group of successive musical pitches, predecessor of modern musical notes. Neumes have been used in Christian ... [6 related articles]
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http://www.britannica.com/eb/a-z/n/28

the name for a musical sign in plainchant notation which designates a very small melodic gesture sung to a single syllable. Standard neumes contained from one to three pitches, though some conglomerate neumes had four, five, or even six pitches.
Found on
https://www.arlima.net/the-orb/encyclop/culture/music/orbgloss.htm

any of various symbols representing from one to four notes, used in the musical notation of the Middle Ages but now employed solely in the notation of Gregorian chant in the liturgical books of the Roman Catholic Church.
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https://www.infoplease.com/dictionary/neume
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