Quote by branny1982
You find out what notes make the chord up.

That chord has the notes D F and A (and some of their octaves)

The D Major Scale is D E F# G A B C#

so you can see that your chord has a flattened 3rd and a perfect 5th, which means it is D minor.


And, because your lowest note is that A (5th fret E string), you notate that with a slash. You're playing a D minor chord over an A root, so the chord is Dm/A.