C#dim is a diminished, spelled C#, E and G. In DADGAD tuning (D2 A2 D3 G3 A3 D4) the easiest shape is x4204x, which sits at fret 2, spans 2 frets, lets 1 string ring open and mutes 2 strings. 12 positions for it are shown below, from the nut up to fret 10.
Notes and intervals
Note
C#
E
G
Interval
1P
3m
5d
12 ways to play it
Ordered by how hard they are to fret, easiest first, one per position on the neck. Fret numbers are relative to the position marked beside each grid.
x4204xsits at fret 2, spans 2 frets, lets 1 string ring open and mutes 2 stringsxxx675sits at fret 5, spans 2 frets and mutes 3 stringsx45075sits at fret 4, spans 3 frets, lets 1 string ring open and mutes 1 stringxx1191011sits at fret 9, spans 2 frets and mutes 2 strings11711010xsits at fret 7, spans 4 frets, lets 1 string ring open and mutes 1 stringxx1101014sits at fret 10, spans 4 frets, lets 1 string ring open and mutes 2 stringsx42042sits at fret 2, spans 2 frets, lets 1 string ring open and mutes 1 stringx420xxsits at fret 2, spans 2 frets, lets 1 string ring open and mutes 3 stringsx42045sits at fret 2, spans 3 frets, lets 1 string ring open and mutes 1 stringx45042sits at fret 2, spans 3 frets, lets 1 string ring open and mutes 1 string24204xsits at fret 2, needs a barre across 3 strings at fret 2, lets 1 string ring open and mutes 1 string2420xxsits at fret 2, needs a barre across 3 strings at fret 2, lets 1 string ring open and mutes 2 strings
Keys C#dim belongs to
C#dim is diatonic to 8 of the 96 keys this app knows, playing a different role in each.