Tjelwu [ˈtʲɛlβu] and its near descendant Čelwu [ˈʧɛlwu] are artlangs developed by Jonathan North Washington in 2002, which were dormant by 2008. It is written with a unique script. The language and its script are descended from the language and script of Tēlvo.
The language's phonology was inspired by Slavic and Semitic languages, and its morphology has Semitic and Turkic elements. The language is spoken by the Timber Wolf clan of Planet Pii.