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) this with other considerations. In British English, it was once common for a colon to be followed by a hyphen or dash to indicate a restful pause, in a typographical construction known as the "dog's bollocks", though this usage is now discouraged. A special triangular colon symbol is used in IPA to indicate that the preceding sound is long. Its form is that of two triangles, each a little larger than a point (dot) of a standard colon, pointing toward each other. It is available in Unicode as "modifier letter triangular colon", Unicode U+02D0 (). A regular colon is often