piano chord
D♭7
D♭1F3A♭5C♭♭7
Major triad, minor seventh. The chord that wants to resolve a fourth up.
Written the other way round it is C♯7 — the same twelve keys on a piano, a different piece of notation.
What is true of it
D♭7 is D♭, F, A♭ and C♭ — 1, 3, 5 and b7 counted from D♭.
On an instrument that cannot reach all 4, the 5 goes first, in that order.