[math-fun] Names

Extending previous ideas, I propose zop = zero or positive ("nonnegative") number, x>=0 zon = zero or negative number zopi=zero or positive integer zoni=zero or negative integer Zop could instead be zom (zero or more) and Zon could instead be zol . Usage: Let x be zopi (let x be zero or a positive integer) (zopi is an adjective), or let x be a zopi (zopi is a noun). Either would be ok, but no "a" makes more sense if you expand zopi. So far as I know, none of these putatively new words are previously used. They are all easily pronounced and unambiguous, and none sounds too silly. Steve Gray