Pongo Pygmaeus is the scientific name for the Bornean orangutan, a species of orangutan that is native to the island of Borneo. While there are no exact synonyms for Pongo Pygmaeus, there are different names used for this species of orangutan in various languages. In Malay language, Bornean orangutan is called "Orangutan Borneo". In Indonesian, it is called "Orangutan Kalimantan". Additionally, the term "red ape" or "primate" may be used to refer to this species. In essence, while there are no synonyms for Pongo Pygmaeus, different languages may have their unique names for this species of orangutan.