Supergirl (Matrix)
Matrix is a fictional character and a superheroine, best known as the 1988-2002 Supergirl, published by DC Comics. She was created by John Byrne as part of his Superman revamp. She first appeared (as Supergirl) in Superman (second series) #16.
In 2006, another character calling herself Matrix was created by Geoff Johns, Grant Morrison, Greg Rucka, Mark Waid, and Dale Eaglesham and first appeared in 52.
http://en.wikipedia.org/wiki/Supergirl
http://en.wikipedia.org/wiki/Supergirl_(Matrix)