: What do two flats next to each other mean? I'm looking at a definition/formula for a chord tone: Diminished 7th Chord Tone Formula = 1, Flat3, Flat5, FlatFlat7 of the major scale Do two flats next to each other mean descend

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Your intuition is correct; the two flats mean that the 7th of the chord is lowered by two semitones.

A 7th that has been flatted is called a minor 7th, while a 7th that has been double-flatted is called a diminished 7th. You will often see the symbol used to indicate double flats, so that a C°7 chord is spelled as C - E? - G? - B.