NDN can mean: NDN (gene) Named Data Networking, a NSF funded future internet architecture research project New Democrat Network, a political organization in the United States Nigel Desmond Norman, British aircraft designer, his company NDN Aircraft, and their products: NDN Firecracker NDN Fieldmaster Shorthand spelling for Indian, a term that some Native Americans in the United States use to refer to themselves Necromancer's DOS Navigator, an orthodox file manager for DOS Northern Distribution Network, part of NATO logistics in the Afghan War...

Irony punctuation is any proposed form of notation used to denote irony or sarcasm in text. Written English lacks a standard way to mark irony, and several forms of punctuation have been proposed. Among the oldest and most frequently attested are the percontation point proposed by English printer Henry Denham in the 1580s, and the irony mark, used by Marcellin Jobard and French poet Alcanter de Brahm during the 19th century. Both marks take the form of a reversed question mark, "⸮". Irony punctuation is primarily used to indicate that a sentence should be understood at a second level. A bracketed...