Double-contrast barium enema Double-contrast barium enema A double-contrast barium enema is a form of contrast radiography in which x-rays of the colon and rectum are taken using two forms of contrast to make the structures easier to see. A liquid containing barium (that is, a radiocontrast agent) is put into the rectum. Barium is a silver-white metallic compound that outlines the colon and rectum on an x-ray and helps show abnormalities. Air is also put into the rectum and colon to further enhance the x-ray. Double-contrast barium enemas are less invasive than a colonoscopy and have comparatively fewer issues in a viable large
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.