guitar chord
G♭11
Six notes in theory; in practice the third is usually dropped, because the eleventh sits a half step above it.
Written the other way round it is F♯11 — the same twelve keys on a piano, a different piece of notation.
Every fingering that fits a hand
212100
moderate · no 5
222100
moderate · no 3, 5
214100
moderate · no 5
242100
moderate · no 3
244100
moderate · no 3
What is true of it
G♭11 is G♭, B♭, D♭, F♭, A♭ and C♭ — 1, 3, 5, b7, 9 and 11 counted from G♭.
On an instrument that cannot reach all 6, the 3, 5 and 1 go first, in that order.
The easiest of the 5 fingerings below is 212100: 4 fingers, held at the 1st fret.
None of them uses an open string, so this chord moves up the neck unchanged — the same shape 1 fret higher is the chord a semitone above.
It leaves out the 5. 6 strings cannot carry 6 notes, and the 5 is the one this chord can lose without changing what it is.
Where its notes are on the neck
The brass dots are G♭, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
G♭11/B♭
646400
G♭11/D♭
999999
G♭11/F♭
012100
An inversion is the same chord with a different note lowest. The name changes to a slash name because the bass is what a listener hears as the foundation.