I was wondering if knotted topological strings can be asigned definite quantum charges apart from mass and angular mumentum. That would really be useful to glueball people who try to find candidate in the hadronic spectrum : they use only mass and angular momentum. If they had a mean to assign for instance P or C values, that would be great for them. Besides, maybe it could be possible to figure out something with flavors, but that seems unlikely to me. Thanks for thoughts, proposals, or even solutions !