It's called vitamin MYTH.
Vitamin
sperm
The testicles (balls) make sperm.
Sperm cell
sperm or male reproductive cells.
Sperm is the name of the male reproductive cell, and semen is the fluid that carries sperm during ejaculation. Semen is produced by the male reproductive organs and contains various proteins and nutrients to support sperm survival and motility.
sperm cell
The male reproductive cell that fertilizes the ovum is called a sperm cell.
Sperm and egg
It is called "milt".
You must be a male. You will begin to make sperm at puberty. These are made in the testicles in the millions per day.
In animals it would be called a sperm. In plants I assume the answer would be the pollen, however, the pollen is not necessarily one cell. Even if it is one cell it will have more than one nucleus (2 or 3).