Diem is known from "Carpe Diem", in English "Seize the Day". Hence Diem possibly means Day. I don't know why the name. Though, if you call it Noctum it has a ne

Diem is known from "Carpe Diem", in English "Seize the Day". Hence Diem possibly means Day. I don't know why the name. Though, if you call it Noctum it has a negative/blackhat connotation, IMO.