"Spermatazoan" or "sperm cell".
when sperm fertilize ovule then it produce another living cell
A sperm cell is called a spermatozoon.
sperm
The cell that fertilises the egg cell is called the sperm cell. _-------O That's how a sperm cell looks like <<<<<<<<<<<<<<<<<
sperm cell
sperm cell
Sperm cell
Sperm cell
spermatocyte
spermatocyte
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).