Rand seems to have a new sword during tGS. One he recognized.

Sorry if this has been discussed. But,are there any popular theories about what's special about it? Or if it's a sword we should recognize? If anything, it's a ter'angreal with no special powers other than being a very strong near unbreakable sword as no hints at all were given to it being an angreal or sa'angreal (and really, does Rand need two sa'angreal swords?)