Banjo D6 chord (Open G)D sixth on the 5-string banjo: 0 2 0 4, and 6 more shapes

Frets, string 4 to string 1: 0 2 0 4 (open position)

1. String 4 (D): open, D
2. String 3 (G): 2nd fret, index finger, A
3. String 2 (B): open, B
4. String 1 (D): 4th fret, ring finger, F♯
5. String 5, the short g: open, G, not in the chord

Sounds: D A B F♯  ·  D6 is D, F♯, A, B (1 · 3 · 5 · 6)

The 5th string: the short g rubs against the F♯ in this shape, a semitone away: some players let it ring, some skip it.

Open G tuning: gDGBD, the short 5th string first, then strings 4 to 1.