Category: Lists of three-character combinations This article is about general United States currency. ... The University of San Diego, frequently referred to as USD, is a Catholic university in San Diego, California. ... The University of South Dakota is a public university in South Dakota, founded in 1862 by the State of South Dakota, although classes were not held until 1882. ... The United States Department of Defense, abbreviated as DoD or DOD and sometimes called the Defense Department, is a civilian Cabinet organization of the United States government. ... It has been suggested that Apocopation be merged into this article or section. ... Acronyms and initialisms are abbreviations formed from the initial letter or letters of words, such as NATO and XHTML, and are pronounced in a way that is distinct from the full pronunciation of what the letters stand for. ... Acronyms and initialisms are abbreviations formed from the initial letter or letters of words, such as NATO and XHTML, and are pronounced in a way that is distinct from the full pronunciation of what the letters stand for. ... Most three-letter English words are only one syllable long; however, there are certain exceptions such as emu and era. ...