The Royal Air Force (RAF) developed a distinctive slang which has been documented in works such as Piece of Cake and the Dictionary of RAF slang. The following is a comprehensive selection of slang terms and common abbreviations used by Royal Air Force from before World War II until the present day; less common abbreviations are not included. The slang of the RAF (sometimes referred to as Slanguage), developed partially from its antecedents of the Royal Flying Corps and Royal Naval Air Service, however, some phrases developed with less certainty of their origin.