The term 'Counter Man' refers to a person who operates a Geiger counter, which is a device used to detect and measure radiation. The two crossword solutions for this term are 'Geiger' (6 letters) and 'HansGeiger' (10 letters). Geiger is the surname of physicist Hans Geiger, who invented the Geiger counter in 1908. Therefore, the term 'Counter Man' can refer to someone who operates a Geiger counter, named after the inventor, Hans Geiger.