So, I'm guessing this is just a triad that all the notes are played at the same time as opposed to all the other kinds of triads. The examples in the triad lessons had all the notes played separately, not strummed all at once like a chord. And the playing all the notes at once is what makes it a chord?
I'm also guessing there must be dozens of other 'simple' chords, by forming a triad based on each note and placing the notes so it can be played all at once like a chord?