Kn

Kn is a digraph comprising the letters K and n in the Latin alphabet. As a two-letter sequence, it appears in many words and can function as an orthographic unit in several languages.

In linguistics, the digraph kn is well known in English, where it is associated with spellings of words that historically had a pronounced k but now often have a silent k, as in knight or knee. Pronunciation and use of kn vary by language and word.

Kn also appears in standardized codes. The lowercase kn is the ISO 639-1 code for Kannada, a Dravidian language spoken mainly in Karnataka, India. The uppercase KN is the ISO 3166-1 alpha-2 code for Saint Kitts and Nevis, and the corresponding internet country code top-level domain is .kn.

In mathematics, Kn is commonly seen in the notation K_n to denote the complete graph on n vertices, a central object in graph theory.

In physics and engineering, the unit of force is the newton; a kilonewton is abbreviated as kN (lowercase k, uppercase N); Kn is not the standard SI symbol.