From The Stargate Omnipedia


Samantha Carter's pet cat, given as a gift to the Tollan Narim. The Tollan do not have animals of this kind on their original home world.

The cat is named for Erwin Shroedinger's theory of indeterminism in quantum mechanics.


Enigma - Carter, dumbfounded the Tollan have not seen animals, gives her new friend Narim her cat, Schroedinger, explaining the theory behind the name.
Pretense - Narim uses Tollan phase technology to send Shroedinger safely through Earth's iris, notifying Earth that an ally was coming through the Stargate.