About this chord (F♯13(no3, no9)):F♯ 13(no3, no9) is a "thirteenth" chord. F♯13(no3, no9)/C♯, F♯13(no3, no9)/E, F♯13(no3, no9)/B, F♯13(no3, no9)/D♯ are the inversions of this chord."F♯" is the root of the chord and its major scale is F♯, G♯, A♯, B, C♯, D♯, E♯About 13(no3, no9) chords:What's that chord again?1P 5P 7m 11P 13M is the chord intervals formula for "13(no3, no9)" chords. The notation can also be simplified to 1 5 b7 11 13.