Gbm7b5 chord for piano with keyboard diagram.
Explanation: The G flat minor seventh flat five is also called G flat half-diminished (also written as Gbø). The chord is abbreviated Gbm7b5, Gbm7(b5) or Gbm7-b5.
Theory: The Gbm7b5 is a G flat minor seventh with a lowered fifth.
Notes: Gb - A - C - E