The term 'Man in Black' can refer to a few different occupations. UMP is an acronym for umpire, which is a person who officiates sports games and enforces the rules. A NINJA is a type of covert agent or mercenary in feudal Japan who specialized in unorthodox warfare. CASH is a reference to the singer Johnny CASH, who was known for wearing all black clothing. Finally, a REAPER is a figure from folklore who is responsible for gathering souls of the dead and guiding them to the afterlife.