Root on A string
x5656x
Dm7♭5 is the D half-diminished chord. Its notes are D, F, A♭ and C. Also written ø7. Often the ii chord in a minor ii–V–i progression.
x5656x
Numbers show frets from the low E string to the high e string; x means don't play that string.
Dm7♭5 is the viiø7 chord in E♭ major. That makes it a natural fit in songs written in those keys.
Every D, F, A♭ and C on the first 12 frets. The filled dots are the root, D. Build your own shape from any nearby group.
Other D chords
Other half-diminished chords