Constructed languages introduced in the 1920s

Interlingue (; ISO 639 ie, ile), originally Occidental (), is an international auxiliary language created in 1922 and renamed in 1949. Its creator, Edgar de Wahl, sought to achieve maximal grammatical regularity and natural character. The vocabulary is based on pre-existing words from various languages and a derivational system which uses recognized prefixes and suffixes.

Novial is an international auxiliary language (IAL) created by Danish linguist Otto Jespersen in 1928. It was designed to facilitate communication between speakers of different native languages. The name of the language is a blend of the Novial word novi (meaning 'new") and IAL.

method of showing social, technological, biological, and historical connections in pictorial form; standardized and abstracted pictorial symbols to represent social-scientific data with serial repetition

constructed language based on Esperanto

Transpiranto is a parody language, a caricature of the international auxiliary language Esperanto. The name contains a play on the Swedish verb transpirera, to perspire. The parody language was developed from 1929 by contributors to the publication Grönköpings Veckoblad ('the Greenville Weekly', a Swedish satirical monthly), through a series of comical translations of well-known Scandinavian songs and poems, more than 200 in all. The first two Transpiranto poems were written by Nils Hasselskog.

international auxiliary language and abbreviated writing system

Panamane [panaˈman] is a constructed language created by the Panamanian Manuel E. Amador in 1922 and compiled in a book titled Fundaments of Panamane: Universal Language in 1936.