Aliumpronouns are any pronouns which are not present in the English language. This encompasses pronouns used in modern languages, pronouns that used to be in use but are no longer used (aka archaeopronouns), or xenopronouns. An aliumpronoun user may feel inclined to use these pronouns for the aesthetic, because they feel a strong connection to a certain language, because it feels comfortable for them, or for reasons one cannot explain.
The concept of aliumpronouns is very abstract itself- it is essentially taking another language's pronoun and using it in modern English. Because not all languages use English's way of constructing pronouns, an aliumpronoun user may need to alter their pronouns in order to make sense of it in the English language.
Etymology
The prefix "alium" comes from the Latin word for "other".
History and flag
The term was coined on June 22, 2021 by Wwki user theancientrune. The flag was designed on the same date by honk4bees, in the style of various other pronoun flags.