piano chord
E♭
E♭1G3B♭5
A major third and a perfect fifth over the root.
Written the other way round it is D♯ — the same twelve keys on a piano, a different piece of notation.
What is true of it
E♭ is E♭, G and B♭ — 1, 3 and 5 counted from E♭.
On an instrument that cannot reach all 3, the 5 goes first, in that order.