What is the use of the colon? What is a colon? Generally it opens onto an explanation, but it is always done with the help of an interruption. It can be said that the colon is not the period, it is the period of the period, the canceling of the period. It is a moment mute and marked; it is the most delicate tattoo of the text. It is also in place of, instead of, everything that would be causal. For example, when we read: "It's simply that: secret." "Secret," is a sentence, it is the shortest sentence perhaps. But it is a sentence in one word. It is a sentence that is secret and that at the same time says its name. One could invert and say: "Secret: it is simply that." This is secret, the secret is the secret of this, it is a word which makes infinite sense all by itself, it is a sentence which performs the secret itself [Clarice Lispector, The Stream of Life, trans Elizabeth Lowe & Earl Fitz, Foreword by Hélène Cixous trans Verena Conley, Minneapolis: University of Minnesota Press, 1989]

…he was doing a breath hydrogen test. If you know the amount of hydrogen someone is exhaling orally, it's a simple matter to extrapolate the amount they're exhaling rectally. This is because a fixed percentage of hydrogen produced in the colon is absorbed into the blood and, and when it reaches the lungs, exhaled. The breath hydrogen test has given flatus researchers a simple, consistent measure of gas production that does not require the subject to fart into a balloon.

Foulmouthed individuals seem to have their neuron systems replaced by colon structures, given that their terminology profusely consists of "sh*t and f*ck". ("Tolerance zero")

She had six months at most left to live. She had cancer, she hissed. A filthy growth eating her insides away. There was an operation, she'd been told. They took half your stomach out and fitted you up with a plastic bag. Better a semicolon than a full stop, some might say.