What does haploid me? what type of cells are haploid? what is the haploid number for humans?

Haploid means it has half the total number of chromosomes. In a human, a haploid cell would have 23 chromosomes. Sex cells, like the sperm and the ovum are haploid. This is so that when they combine, the zygote formed is a diploid cell with 46 chromosomes, in a human.

Google defines it as:

"a region of the forebrain below the thalamus which coordinates both the autonomic nervous system and the activity of the pituitary, controlling body temperature, thirst, hunger, and other homeostatic systems, and involved in sleep and emotional activity."

basically, its a part of the brain below the thalamus and it controls your homeostatic systems. it also helps decide if you're gonna get good sleep and how you feel