It's a polychord, A polychord being two chords stacked together to create a unigue new chord. Generally used in larger ensembles.

Here's the notes.

A, C#, E, G#, B#.

You got C#m/maj7 in there: C#, E, G#, B#.

...and

an A major chord: A C# and E.

Polychord: C#m/maj7/A.

That's just one example, the important thing would be how this chord would be voiced.