piano chord
E♭5
E♭1B♭5
Root and fifth, no third at all — neither major nor minor, which is the point.
Written the other way round it is D♯5 — the same twelve keys on a piano, a different piece of notation.
What is true of it
E♭5 is E♭ and B♭ — 1 and 5 counted from E♭.