K with stroke is a letter of the Latin alphabet

Latin alphabet

The Latin alphabet, also called the Roman alphabet, is the most recognized alphabet used in the world today. It evolved from a western variety of the Greek alphabet called the Cumaean alphabet, which was adopted and modified by the Etruscans who ruled early Rome...

, derived from K

K

K is the eleventh letter of the English and basic modern Latin alphabet.-History and usage:In English, the letter K usually represents the voiceless velar plosive; this sound is also transcribed by in the International Phonetic Alphabet and X-SAMPA....

 with the addition of a bar

Bar (diacritic)

A bar or stroke is a modification consisting of a line drawn through a grapheme. It may be used as a diacritic to derive new letters from old ones, or simply as an addition to make a grapheme more distinct from others....

 through the letter.

It was used in Latin as an abbreviation for words that start with k. In Old Norse

Old Norse

Old Norse is a North Germanic language that was spoken by inhabitants of Scandinavia and inhabitants of their overseas settlements during the Viking Age, until about 1300....

 it was used for "konungr" (king) or to abbreviate the word "skulu" (shall) to "sꝁ".

It is used as a phonetic symbol

Phonetic transcription

Phonetic transcription is the visual representation of speech sounds . The most common type of phonetic transcription uses a phonetic alphabet, e.g., the International Phonetic Alphabet....

representing a x.

Computer encodings

Capital and small K with stroke is encoded in Unicode

Unicode

Unicode is a computing industry standard for the consistent encoding, representation and handling of text expressed in most of the world's writing systems...

as of version 5.1, at codepoints U+A740 and U+A741.