Double-contrast barium enema bowel. 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
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.,