The D lydian dominant seventh chord is a 5-note chord consisting of the notes D, F#, A, C and G#.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as D7#11.
Interactive piano diagram for the D lydian dominant seventh chord
Chords that are a subset of D7#11. These contain less notes but all of them are included in D7#11.