Manipulated varieties of English: Built for practical purposes

Constructed varieties of English
Basic English is simplified for easy
international use. It is used by manufacturers and other international businesses to write manuals and communicate. Some English schools in Asia teach it as a practical subset of English for use by beginners.
Special English is a simplified version of English used by the Voice of America. It uses a vocabulary of only 1500 words.
English reform is an attempt to improve collectively upon the English language.
Seaspeak and the related Airspeak and Policespeak, all based on restricted vocabularies, were designed by Edward Johnson in the 1980s to aid international cooperation and communication in specific areas. There is also a tunnelspeak for use in the Channel Tunnel.
Euro-English is a concept of standardising English for use as a second language in continental Europe.
Manually Coded English — a variety of systems have been developed to represent the English language with hand signals, designed primarily for use in deaf education. These should not be confused with true sign languages such as British Sign Language and American Sign Language used in Anglophone countries, which are independent and not based on English.
E-Prime excludes forms of the verb to be.
Euro-English (also EuroEnglish or Euro-English) terms are English translations of European concepts that are not native to English-speaking countries. Because of the United Kingdom's (and even the Republic of Ireland's) involvement in the European Union, the usage focuses on non-British concepts. This kind of Euro-English was parodied when English was "made" one of the constituent languages of Europanto.