The appendix to 1984 is Orwell's explanation of Oceania's official language, Newspeak, of which there are many examples throughout the text, such as doublethink and duckspeak, and discusses the purpose for its conception.
Newspeak consists of the A vocabulary, the B vocabulary, and the C vocabulary. The A vocabulary consists of words needed for everyday life and words that already exist but have been stripped of all shades of meaning.
The B vocabulary consists of words that have been deliberately constructed for political purposes and are a kind of verbal shorthand; all are compound words, such as goodthink.
The C vocabulary consists entirely of scientific and technical words and follows the same grammatical rules as the A and B vocabularies.
