I'm not sure but I think its called Rosin, or when you say it it sounds like Rosin. Anyway, its a baseball thing for pitchers, so check your local sporting good stores.
Its not nearly as good as chalk for grip.
My tight as gym doesnt allow chalk, but sometimes you gotta break rules. So when the owner comes around I just go with the old "what the hell is that white shit on the bar" he hasnt caught me yet.
Later