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) of a list: while a double colon codice_3 is read as "has type of" (compare scope resolution operator): The ML languages (including Standard ML and OCaml) have the above reversed, where the double colon (codice_3) is used to add an element to the front of a list; and the single colon (codice_5) is used for type guards. MATLAB uses the colon as a binary operator that generates vectors, as well as to select particular portions of existing matrices. In Python, which uses indentation to indicate blocks, the colon is used in statements to indicate that the next line is the