The C# diminished whole–half / Db diminished whole–half scale has 8 notes: C#, D#, E, F#, G, A, A# and C. Its formula is 1 2 b3 4 b5 #5 6 7 and its steps, in tones, are 1 – ½ – 1 – ½ – 1 – ½ – 1 – ½.
The whole–half diminished scale alternates a tone and a semitone: eight symmetrical notes, used in jazz over diminished chords.
C# diminished whole–half
C# D# E F# G A A# C · 1 2 b3 4 b5 #5 6 7
Colored dots: notes of the scale, the root is the darkest.