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) languages like Haskell use a double colon (::) to indicate type instead. A colon is also sometimes used to indicate a tensor contraction involving two indices, and a double colon (::) for a contraction over four indices. Additional colon-related symbols for math are encoding in Unicode: In computing, the colon character is represented by ASCII code 58, (HTML :) and Unicode . Several compatibility forms for Chinese and Japanese typography are also encoded: In Hebrew: In the Budu language of the Democratic Republic of the Congo: In Microsoft Windows filenames, the colon is reserved for use in alternate data streams.