The G minor chord is a 3-note chord consisting of the notes G, Bb and D.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Gm.
Chords that are a superset of Gm. The chords include more notes but always G, Bb and D.
Chords that are a subset of Gm. These contain less notes but all of them are included in Gm.
In case you prefer a non-interactive variant of the chord chart, we've embedded a PNG image below that shows the notes for the the Gm chord. Feel free to save or share the image as needed.