* Gametes (sex cells): These are sperm cells in males and egg cells (ova) in females. They are haploid because they only contain one set of chromosomes (n) from each parent, which combine during fertilization to form a diploid zygote.
* Spores (in some organisms): Some plants and fungi produce haploid spores, which can develop into a new organism without fertilization. These spores are also haploid and contain only one set of chromosomes.
Let me know if you'd like more information about any of these types of cells!