Voicing of Gb Minor 7

Drop 2 III

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Left hand
Gb2
Right hand
Gb3Db4Fb4Bbb4
Family
Drop 2

The Drop 2 III voicing of Gbm7 stacks Gb, Db, Fb and Bbb from the bottom up: the root, 5th, minor 7th and minor 3rd of the chord.

It's one of the Drop 2 voicings: four-note chords in close position with the second note from the top dropped an octave, played over the root. The others for Gbm7 are Drop 2 I, Drop 2 II and Drop 2 IV.