That means every single minor scale is comprised of those seven chords. If you're not familiar with this notation, you can read up on roman numeral analysis.
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Music Theory: Music theory piano players use: scales, key signatures, the chords inside a key and how to read them, all playable as interactive sheet music in your browser.
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A Flat Minor Triad Chords (Piano): The seven A-flat minor triads are A♭m, B♭dim, C♭, D♭m, E♭m, F♭ and G♭. Each one spelled out on a piano keyboard you can play, plus the progressions they make.
A Sharp Minor Triad Chords (Piano): The seven A-sharp minor triads are A♯m, B♯dim, C♯, D♯m, E♯m, F♯ and G♯. Each one spelled out on a piano keyboard you can play, plus the progressions they make.
B Flat Minor Triad Chords (Piano): The seven B-flat minor triads are B♭m, Cdim, D♭, E♭m, Fm, G♭ and A♭. Each one spelled out on a piano keyboard you can play, plus the progressions they make.
More in This Section
Key of A Flat Major: The key of A Flat Major: four flats (B♭, E♭, A♭, D♭), the notes A♭ B♭ C D♭ E♭ F G, and all seven chords, A♭, B♭m, Cm, D♭, E♭, Fm, Gdim.
Key of A Major: The key of A Major: three sharps (F♯, C♯, G♯), the notes A B C♯ D E F♯ G♯, and all seven chords, A, Bm, C♯m, D, E, F♯m, G♯dim.