piano chord
C♯
C♯1E♯3G♯5
A major third and a perfect fifth over the root.
Written the other way round it is D♭ — the same twelve keys on a piano, a different piece of notation.
What is true of it
C♯ is C♯, E♯ and G♯ — 1, 3 and 5 counted from C♯.
On an instrument that cannot reach all 3, the 5 goes first, in that order.