Root on A string
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Fm7♭5 is the F half-diminished chord. Its notes are F, A♭, C♭ and E♭. Also written ø7. Often the ii chord in a minor ii–V–i progression.
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Numbers show frets from the low E string to the high e string; x means don't play that string.
Fm7♭5 is the viiø7 chord in G♭ major. That makes it a natural fit in songs written in those keys.
Every F, A♭, C♭ and E♭ on the first 12 frets. The filled dots are the root, F. Build your own shape from any nearby group.
Other F chords
Other half-diminished chords