Biology · Reproduction

The term that best describes a mature, motile, and haploid sperm cell produced during spermatogenesis is "spermatozoon" or simply "spermatozoa" (plural). A spermatozoon is the final stage of spermatogenesis and represents the functional male gamete capable of fertilizing an egg during sexual reproduction. Spermatozoa are characterized by their streamlined structure, consisting of a head, midpiece, and tail, which enables them to move efficiently toward the egg. 

Spermatids are mature but they are not motile.

Spermatogonium is a cell formed at the early stages of the formation of spermatozoa, formed in the walls of the seminiferous tubules and giving rise to spermatocytes by mitosis.

Secondary spermatocytes are haploid cells, smaller than primary spermatocytes and they give rise to spermatids by meiosis.

Spermatozoa are mature, motile male sex cells by which the ovum is fertilized. It has one of more flagella for swimming and has a head containing acrosomes.