The E-sharp half-diminished seventh chord (abbreviated "E#m7(b5) chord") is a four-note chord consisting of the notes E♯, G♯, B, and D♯. The chord is formed by lowering the fifth of a E-sharp minor seventh chord a half step.
E-sharp half-diminished seventh chord
E-sharp half-diminished chord E-sharp minor seventh flat five chord
E♯ G♯ B D♯
1 ♭3 ♭5 ♭7
E♯ø E♯ø7 E♯m7b5 E♯–7(b5) E♯mi7(b5) E♯min7(b5)
tetrad (four-note chord)