thanks a bundle anyway!:/ In case ur curious, I found that there isn't one. However, you can indicate a set of # with a given property like this → { χ: property }
That means i could just write {χ: prime} or... I could invent a symbol and be mathematically famous like all those guys who come up with random constants (Boltzman, Planck, Avogadro...)

I do not think so, hmm you can ask this question in the chat forum or number theory forum and see what other members say