Ddim is a diminished chord made of 3 notes: D, F, A♭. It sounds tense and unstable, and you hear it in passing chords between two others, and the vii chord of a major key. It is the vii° chord of E♭ major and turns up in 1 other key.
The library above opens on Ddim with 12 shapes up and down the neck. Tap a shape to hear it, or play it one string at a time.