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