Minor seventh
In music theory, a minor seventh is one of two musical intervals that span seven staff positions. It is minor because it is the smaller of the two sevenths, spanning ten semitones. The major seventh spans eleven. Wikipedia
Semitones: 10
12-Tone equal temperament: 1000
Abbreviation: m7
Interval class: 2
Just interval: 16:9 or 9:5
Just intonation: 996 or 1018