When each chromosome is present once not as a pair it is called?

When each chromosome is present once, not as a pair, it is called a haploid state. This is typically seen in gametes (sperm and egg cells) in sexually reproducing organisms, where the chromosome number is half that of the diploid state, which contains pairs of chromosomes. In humans, for example, haploid cells have 23 chromosomes, while diploid cells have 46.