As the number of deaths in the concentration camps rose, the SS began restructuring the numbers it used to register each death. Instead of sequential numbers, which would have clearly revealed how many people had already died in the camp in a given year, they began using combinations of Roman and Arabic numerals. In May 1943, Himmler ordered that 185 people should always be registered under a single Roman numeral, i.e., I/1 to I/185, then II/1 to II/185, etc. The number X/137/44 for Salvatore Coviello in the Bergen-Belsen death book, for example, reveals nothing to outsiders about how many prisoners had already died there before Coviello’s death on December 14, 1944. In fact, he was the 1,802nd deceased prisoner to be registered that year in Bergen-Belsen.