Caligula's "praenomen" was Gaius, his "nomen" Julius, his "cognomen" Caesar. The binomial name consisting of "praenomen" and "nomen" eventually spread throughout Italy. It is likewise seen as a "nomen dubium". In official contexts, the initials "N.N." (from the Latin "nomen nescio", "name unknown") are used. Caesar often spoke of himself only as "Caius Caesar", omitting the "nomen gentile Iulius". Persons could be adopted into a gens and acquire its nomen. The etymology of the nomen "Sergius" is problematic. Notably Clodius' children would return to the "patrician" spelling of their nomen. The term 'nominalism' stems from the Latin "nomen", "name". The term "nominalism" comes from the Latin "nomen" ("name"). A Roman woman kept her own family name "(nomen)" for life. Thus, its motto is A Calce Nomen. However, he is better known by his "nomen", or personal name. The Golden Horus and nomen and prenomen titles were later added. At least two distinct linguistic origins have been proposed for the nomen "Artorius".