Sona is an international auxiliary language created by Kenneth Searight and described in a book he published in 1935. The word in the language itself means "auxiliary neutral thing". The similarity to the English word 'sonorous' is superficial.
Searight created Sona as a response to the Eurocentricity of other artificial auxiliary languages of his time, such as Esperanto and Ido. At the same time, Searight intended his language to be more practical than most a priori languages like Solresol or Ro, which were intended to be unbiased by any particular group of natural languages. Thus, Sona sacrificed familiarity of grammar and lexicon for some measure of "universality", while at the same time preserving basic notions common to grammars around the world such as compounding as a method of word formation. Searight used inspiration from many diverse languages, including English, Arabic, Turkish, Chinese and Japanese, to create his eclectic yet regular and logical language.
Searight specifically chose only sounds that speakers of many languages could say, therefore making it a true universal language. He hoped that in a perfect world, Sona would be taught to young children everywhere.
Sona is an agglutinative language with a strong tendency towards being an isolating language. The language has 360 radicals or root words whose meanings are based on the categories in Roget's original thesaurus, plus an additional 15 particles. Ideas and sentences are formed by juxtaposing the radicals. Thus, ra "male" plus ko "child" makes rako "boy".
Searight's book, Sona; an auxiliary neutral language (London, K. Paul, Trench, Trubner & Co., Ltd., 1935, LCCN: 35016722) is the only published example of this language. There is a small community on the Internet interested in reviving and using Sona.
Writing
Sona uses the Latin alphabet and contains 24 letters. Although the author provides the rules for writing in Sona in his text, he also specifies that Sona has "few hard and fast rules." The alphabet letters are "named" by adding the vowel y. For the vowels of the alphabet, the y is initial, such as ya, ye, yi, yo, yu, y, and is final for aspirates and consonants, such as cy, gy, ky, etc. The y is also useful for separating two like vowels in a word and for separating an -n radical from a vowel. For instance, ta-ata becomes tayata and ta-o becomes tayo. This helps reduce confusion by distinguishing words from other similar combined radicals. i and u are shortened before a vowel. The only consonant that is final allowed is -n.