A#dim is a diminished, spelled A#, C# and E. In Standard tuning (E2 A2 D3 G3 B3 E4) the easiest shape is x12320, which sits at fret 1, spans 2 frets, lets 1 string ring open and mutes 1 string. 12 positions for it are shown below, from the nut up to fret 14.
Notes and intervals
Note
A#
C#
E
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.
x12320sits at fret 1, spans 2 frets, lets 1 string ring open and mutes 1 stringxxx320sits at fret 2, spans 1 fret, lets 1 string ring open and mutes 3 strings6786xxsits at fret 6, needs a barre across 4 strings at fret 6 and mutes 2 stringsxx8650sits at fret 5, spans 3 frets, lets 1 string ring open and mutes 2 stringsx131415140sits at fret 13, spans 2 frets, lets 1 string ring open and mutes 1 stringxxx15140sits at fret 14, spans 1 fret, lets 1 string ring open and mutes 3 strings9789xxsits at fret 7, spans 2 frets and mutes 2 stringsxx89119sits at fret 8, spans 3 frets and mutes 2 stringsxx119110sits at fret 9, spans 2 frets, lets 1 string ring open and mutes 2 strings048650sits at fret 4, spans 4 frets and lets 2 strings ring open01311xxxsits at fret 11, spans 2 frets, lets 1 string ring open and mutes 3 stringsxxx151412sits at fret 12, spans 3 frets and mutes 3 strings
Keys A#dim belongs to
A#dim is diatonic to 8 of the 96 keys this app knows, playing a different role in each.