piano chord
D♯maj7
D♯1F𝄪3A♯5C𝄪7
Major triad with a major seventh: a half step below the root, an octave up.
Written the other way round it is E♭maj7 — the same twelve keys on a piano, a different piece of notation.
What is true of it
D♯maj7 is D♯, F𝄪, A♯ and C𝄪 — 1, 3, 5 and 7 counted from D♯.
F𝄪 and C𝄪 are double sharps, and they have to be: every letter from D♯ upwards is used once, so the 3 cannot be written any other way.
On an instrument that cannot reach all 4, the 5 goes first, in that order.