Rigellian Trade Dialect, also called Rigellian Trade Lingo, was a simplied form of the Rigellian language, dedicated to trade purposes (TOS novel: The Final Reflection, FASA RPG module: The Orions: Book of Common Knowledge).
The parent Rigellian language was adapted by the Rigellians from some older tongue (probably that of the Masters) to suit their needs and speech difficulties. It was often mistaken for an Orion language (FASA RPG module: The Orions: Book of Common Knowledge).
The Rigellian Trade Lingo was used by all merchants dealing in the Rigel system. It was a simple tongue that was easy to learn and use, hard to misunderstand, and quick to communicate. It had a large number of adjectives and adverbs designed for describing cargoes, and each word had a single, unmistakable meaning (FASA RPG module: The Orions: Book of Common Knowledge).
'Discount goods' was the translation of the Rigellian word for things that did not work or were non-functional. (FASA RPG module: The Klingons) Rigellian Trade Lingo even absorbed the word 'okay' from Earth's English language, with the word spreading to worlds a thousand parsecs from Earth (FASA RPG module: The Orions: Book of Common Knowledge). It also used the suffix "-ese" to turn a nation's name into its language, e.g., "Klingonese" (TOS novel: The Final Reflection).