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→Harmonic Function: Leading Chord
|B Diminished#Diminished Fifth Interval|Dim 5th Interval}}
B dim is diatonic to the key of C Major, using its 7th scale degree as the root note. Thus, it is called the '''vii{{dim}} chord''' (or vii or viio when the {{dim}} symbol cannot be made). The {{dim}} symbol indicates diminished, but you have to be careful - we are dealing with the diminished triad here, not the [[7th Chords#Half Diminished|diminished 7th]]. The diminished 7th chord has two variations - half and full. Half is indicated with a slash through the {{dim}} symbol (B{{hdim}}{{7}}). Full uses the normal symbol (B{{dim}}{{7}}). <small>''Where the {{dim}} symbol cannot be made, such as on a standard keyboard without using special character codes, or to avoid ambiguity, you can use "dim" (ex. Bdim) to indicate the diminished quality of the chord. Then a half diminished 7th can be written as Bm7b5''.</small>
The vii chord is called the '''leading chord'''. Harmonically, it has a ''dominant'' function, sharing the leading tone and 2nd of the scale with the V chord.