piano chord
B♭aug
B♭1D3F♯♯5
Two major thirds stacked. Symmetrical: every note can be heard as the root.
Written the other way round it is A♯aug — the same twelve keys on a piano, a different piece of notation.
What is true of it
B♭aug is B♭, D and F♯ — 1, 3 and #5 counted from B♭.