piano chord
D♯m(maj7)
D♯1F♯♭3A♯5C𝄪7
Minor triad, major seventh — the tonic chord of harmonic minor.
Written the other way round it is E♭m(maj7) — the same twelve keys on a piano, a different piece of notation.
What is true of it
D♯m(maj7) is D♯, F♯, A♯ and C𝄪 — 1, b3, 5 and 7 counted from D♯.
C𝄪 is a double sharp, and it has to be: every letter from D♯ upwards is used once, so the 7 cannot be written any other way.
On an instrument that cannot reach all 4, the 5 goes first, in that order.
D♯ in other shapes
Cm(maj7)C♯m(maj7)D♭m(maj7)Dm(maj7)Em(maj7)Fm(maj7)F♯m(maj7)G♭m(maj7)all 374