A major fourth

music notation
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MSK 007 Leapfrog VCF (patch; see in online store)
MSK 009 Coiler VCF (patch; see in online store)

Equivalent chord symbols: A3+♯3, D5+♭1, A3+♯10, D♭5♯5+♯1, C♯sus2♯5♭2, D♭sus2♯5♭2.

Notes in this chord: A, C♯, D. Integer notation: {1, 2, 9}.

Keys in which this chord fits with this spelling: DM, AM, Bm, F♯m

Keys in which this chord fits with enharmonic spelling: C♭m, G♭m

Nearby chords (one less note): A3, D5, D♭2♭2.

Nearby chords (one more note): A+4, A4+2, A4+7, D+♭1, F6♯5, A4+♯1, A4+♯2, A4+♯4, A4+♯7.

Parallel chords (same structure, different root): C4, D4, E4, F4, G4, B4, C♭4, D♭4, E♭4, F♭4, G♭4, A♭4, B♭4, C♯4, D♯4, E♯4, F♯4, G♯4, A♯4, B♯4.

Experimental fretting charts for guitar standard EADGBE tuning (change tuning or instrument):