Guitar chords: Dflat diminished seventh
Dbdim7
 XX
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 ||1|2|  11th fret
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 |||3|4
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   DACF
   bbbb
    bb

Notes: 1  : Db 
       m3 : Fb
       d5 : Abb  
       bb7: Cbb
These diminished chords all have the same notes as each other: Edim7, Gdim7, Bbdim7, and Dbdim7.