triun
Triun is a term that can refer to several different concepts, primarily in the context of mathematics and finance. In a mathematical setting, "triun" is not a standard or widely recognized term. It is possible it is a neologism, a typo, or a specialized term within a very specific niche field that has not gained general currency. Without further context, it is difficult to define its precise mathematical meaning.
In financial contexts, "triun" can sometimes be used informally as a shortened or colloquial form of "trillion."