A is A, C♯ and E — the 1, 3 and 5 of A. The five CAGED shapes above are the open-chord forms moved up the neck, in the order they appear; ‹ › walk them. Root, major 3rd, perfect 5th — the most consonant chord About the major triad →
Also written A maj triad, A major chord, A maj chord, Amajor and Amaj.