F♯11 (also written G♭11) is a dominant eleventh chord made of 6 notes: F♯, A♯, C♯, E, G♯, B. It sounds thick and open, and you hear it in soul, funk and fusion, often played without the third. It is the V chord of B major and turns up in 2 other keys.
The library above opens on F♯11 with 14 shapes up and down the neck. Tap a shape to hear it, or play it one string at a time.