List of baseball jargon

The following is an alphabetical list of selected unofficial terms, phrases, and other jargon used in baseball, and explanations of their meanings. See also baseball slang for slang in general usage that originated in baseball. For an exhaustive list, see The New Dickson Baseball Dictionary, by Paul Dickson.

K

;K

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:Strikeout. A backwards K is sometimes used to denote a strikeout looking and forwards to indicate a strikeout swinging. Originating from the last letter of "struck" (as per Henry Chadwick, inventor of baseball scorekeeping techniques) and reinforced by inference of "knockout" or "K.O."

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;keystone sack

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:Second base. Like the keystone of an arch, second base is "key" to both scoring (a runner on the base is in "scoring position") and preventing scoring (by defensive "strength up the middle").

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