Category: Lists of three-character combinations The Caltech Submillimeter Observatory (or CSO) is a 10. ... Central Statistical Office of Poland (Główny Urząd Statystyczny, GUS) is the main government executive agency of Poland charged with the collection and publication of statistics related to the economy, population and society of the Poland, at both national and local levels. ... The Central Statistics Office (CSO) is the statistical agency responsible for the gathering of information relating to economic, social and general activities and conditions in the Republic of Ireland, in particular the National Census which is held every five years. ... The De Beers Group is a Johannesburg-based diamond mining and trading corporation. ... The Chicago Symphony Orchestra, based in Chicago, Illinois, is one of the leading orchestras in the world. ... Cincinnati Music Hall As the fifth-oldest orchestra in the United States, the Cincinnati Symphony Orchestra (CSO) has a legacy of fine music making as reflected in its performances in historic Music Hall, recordings, and international tours. ... A chief security officer is a corporations top executive who is responsible for security. ... Civil society or civil institutions refers to the totality of voluntary civic and social organizations or institutions which form the basis of a functioning society as opposed to the force backed structures of a state (regardless of that states political system). ... Colour-separation overlay is the collective technical term for what is commonly called chroma keying. ... Combat Systems Officer is the new term for US Air Force navigators who attend Combat Systems Officer training at Randolph AFB, TX. It basically merges the old navigator (NAV) track, the weapons systems officer (WSO) track with the old electronic warfare officer (EWO) track to produce an aviator who is... The introduction to this article provides insufficient context for those unfamiliar with the subject matter. ... In the United Kingdom, a Police Community Support Officer (PCSO) is a uniformed civilian working with the Police. ... Image File history File links Disambig_gray. ... It has been suggested that Apocopation be merged into this article or section. ... Acronyms and initialisms are abbreviations, such as NATO, laser, and LED, written as the initial letter or letters of words, and pronounced on the basis of this abbreviated written form. ... Acronyms and initialisms are abbreviations, such as NATO, laser, and LED, written as the initial letter or letters of words, and pronounced on the basis of this abbreviated written form. ... Most three-letter English words are only one syllable long; however, there are certain exceptions such as emu and era. ...