Abdominal x-ray as a scout film for other procedures such as barium enemas. An upper gastrointestinal series is where a contrast medium, usually a radiocontrast agent such as barium sulfate barium salt mixed with water, is ingested or instilled into the gastrointestinal tract, and X-rays are used to create radiographs of the regions of interest. The barium enhances the visibility of the relevant parts of the gastrointestinal tract by coating the inside wall of the tract and appearing white on the film. A lower gastrointestinal series is where radiographs are taken while barium sulfate, a radiocontrast agent, fills the colon via an
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.,