K with diagonal stroke (Ꝃ, ꝃ) is a letter of the Latin alphabet, derived from K with the addition of a diagonal bar through the leg.

This letter is used in medieval texts as an abbreviation for kalendas, calends, as well as for karta and kartam, a document or writ.^[1][2] The same function could also be performed by "K with stroke" (Ꝁ, ꝁ), or "K with stroke and diagonal stroke" (Ꝅ, ꝅ).^[1]

In the Breton language, this letter is used, mainly from the fifteenth to the twentieth century, to abbreviate Ker, a prefix used in place names, similar to the Welsh caer.^[3]

• 
  Tomb of Louis-Marie-Gabriel Le Coat de Kerveguen
• 
  Kersan river
• 
  Menhir of Kerluhir
• 
  Ker Hermine

Capital and small K with diagonal stroke is encoded in Unicode as of version 5.1, at codepoints U+A742 and U+A743.^[4][5]

It may be transliterated as ⟨K'⟩ or ⟨K/⟩ as in the name of Emeline K/Bidi (French pronunciation: [kɛʁbidi]), a French Réunion politician with a Breton surname.^[6]

• Adriano Cappelli, Lexicon Abbreviaturarum, J. J. Weber, Leipzig (1928).

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