Upper gastrointestinal series tract in addition to barium, and this procedure is called double-contrast imaging. In this case the gas is referred to as the negative contrast medium. Traditionally the images produced with barium contrast are made with plain-film radiography, but computed tomography is also used in combination with barium contrast, in which case the procedure is called CT enterography. Various types of barium X-ray examinations are used to examine different parts of the gastrointestinal tract. These include barium swallow, barium meal, barium follow-through, and barium enema. The barium swallow, barium meal, and barium follow-through are together also called an upper gastrointestinal series
Colon (punctuation) used as a fallback when this character is not available, and in the practical orthography of some languages which have a phonemic long/short distinction in vowels. If the upper triangle is used without the lower one ("modifier letter half triangular colon", Unicode U+02D1: ), it designates a "half-long" vowel. Other phonetic alphabets also use colons. For example, the Uralic Phonetic Alphabet uses In Finnish and Swedish, the colon can appear inside words in a manner similar to the apostrophe in the English possessive case, connecting a grammatical suffix to an abbreviation or initialism, a special symbol, or a digit (e.g.,