Four haploid cells (which are called gametes). In males, the end result is four haploid cells from one diploid cell. They are all fully functional (unless there's a problem), and they are called sperms.
In females, four haploid cells are once again produced by one diploid cell. They all serve a purpose during meiosis (they give most of their contents to one cell), but only one can be succesfully fertilized. One cell, the functional one, is called the egg. The others are called polar bodies, and they just die if a sperm attempts to fertilize them.