A Persian word
literally meaning "black".
It's generally used in two main contexts; either to describe jet black garments/objects or as an adjective/noun for
people with very dark black HAIR, EYEBROWS or EYES, in a completely NON-derogatory manner!
It is never used by the general Persian speaker to describe
people with darker skin colour e.g. those of African descent, let alone in a derogatory way (as opposed to what's been suggested here before).