The D augmented chord is a 3-note chord consisting of the notes D, F# and A#.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Daug.
Chords that are a superset of Daug. The chords include more notes but always D, F# and A#.
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 Daug chord. Feel free to save or share the image as needed.