K

This article is about the letter of the alphabet. For other uses, see K (disambiguation).

Writing cursive forms of K

K (named kay /ˈkeɪ/) is the eleventh letter of the modern English alphabet and the ISO basic Latin alphabet. In English, the letter K usually represents the voiceless velar plosive.

History

Egyptian hieroglyph D	Proto-Semitic K	Phoenician K	Etruscan K	Greek Kappa

The letter K comes from the Greek letter Κ (kappa), which was taken from the Semitic kap, the symbol for an open hand. This, in turn, was likely adapted by Semites who had lived in Egypt from the hieroglyph for "hand" representing D in the Egyptian word for hand, d-r-t. The Semites evidently assigned it the sound value /k/ instead, because their word for hand started with that sound.

In the earliest Latin inscriptions, the letters C, K and Q were all used to represent the sounds /k/ and /g/ (which were not differentiated in writing). Of these, Q was used to represent /k/ or /g/ before a rounded vowel, K before /a/, and C elsewhere. Later, the use of C and its variant G replaced most usages of K and Q. K survived only in a few fossilized forms such as Kalendae, "the calends".

When Greek words were taken into Latin, the Kappa was transliterated as a C. Loanwords from other alphabets with the sound /k/ were also transliterated with C. Hence, the Romance languages generally use C and have K only in later loanwords from other language groups. The Celtic languages also tended to use C instead of K, and this influence carried over into Old English.

Use in writing systems

English

Today, English is the only Germanic language to productively use "hard" ⟨c⟩ (outside of the digraph ⟨ck⟩) rather than ⟨k⟩ (although Dutch uses it in learned words of Latin origin, and the pronunciation of these words follows the same hard/soft distinction as in English). The letter ⟨k⟩ is usually silent at the start of an English word when it comes before the letter ⟨n⟩, as in the words "knight," "knife," "knot," "know," and "knee".

Other languages

In most languages where it is employed, this letter represents the sound /k/ (with or without aspiration) or some similar sound.

Other systems

The International Phonetic Alphabet uses ⟨k⟩ for the voiceless velar plosive.

Other uses

In modern-day English slang, the word "k" is used as a substitute for the abbreviation "OK", or Okay. This slang is commonly used in emailing, texting and instant messaging. In International Morse code it is used to mean "over".

Related characters

Ancestors, descendants and siblings

• 𐤊 : Semitic letter Kaph, from which the following symbols originally derive
• Κ κ/ϰ : Greek letter Kappa, from which K derives
• К к : Cyrillic letter Ka, also derived from Kappa
• K with diacritics: Ƙ ƙ Ꝁ ꝁ Ḱ ḱ Ǩ ǩ Ḳ ḳ Ḵ ḵ

Ligatures and abbreviations

• ₭ : Lao kip

Computing codes

Character	K		k		K
Unicode name	LATIN CAPITAL LETTER K		LATIN SMALL LETTER K		KELVIN SIGN
Encodings	decimal	hex	decimal	hex	decimal	hex
Unicode	75	U+004B	107	U+006B	8490	U+212A
UTF-8	75	4B	107	6B	226 132 170	E2 84 AA
Numeric character reference	K	K	k	k	K	K
EBCDIC family	210	D2	146	92
ASCII 1	75	4B	107	6B

¹ Also for encodings based on ASCII, including the DOS, Windows, ISO-8859 and nMacintosh families of encodings.

Other representation

NATO phonetic	Morse code
Kilo	–·–

Signal flag	Flag semaphore	Braille dots-13

Other usage

• "K" replacing "C" in Satiric misspelling
• K is the unit symbol for the Kelvin temperature scale.
• K is the chemical symbol for the element potassium (K is an abbreviation of kalium, the Latin name for potassium).
• Triangle K
• Unit prefix
• K is the name of the principal character in Kafka's novel The Trial
• In chess notation, the letter K represents the King (WK for White King, BK for Black King).
• In baseball scoring, the letter K is used to represent a strikeout. A forwards oriented K represents a "strikeout swinging"; a backwards oriented K () represents a "strikeout looking".
• As abbreviation for O.K., often used in emails and short text messages.
• K is used as a slang term for Ketamine among recreational drug users.
• In the CMYK color model, K represents black ink.

External links

• Media related to K at Wikimedia Commons
• The dictionary definition of K at Wiktionary
• The dictionary definition of k at Wiktionary