A/C♯
A Major over C♯ · 3 fingerings
A slash chord: a A major triad with C♯ in the bass instead of the root. The chord above stays the same — only the lowest note changes — which lets A/C♯ walk the bass by step through a progression while the harmony holds. A simple trick that makes ordinary chord sequences sound considerably more composed.
A/C♯ · position 1 · fret 2
A/C♯ · position 2 · fret 2
A/C♯ · position 3 · fret 4