"K" as in Cain
In 2009, the club made that ritual official by hanging 21 signs on that same wall, one more than the major league nine-inning game strikeout record. At the start of a game, each sign shows a blank back, hiding the letter K on the reverse. After each strikeout by a San Francisco pitcher, fans seated directly behind the signs in the front row of section 151 reveal the K in front of them. The signs have handles and hanging holes at the top and the bottom, so fans may rotate the sign upside down if the batter was caught looking. The resulting backwards K is the scorecard symbol to note when a batter takes strike three. Ushers are close by to make sure the designated fans complete their task smoothly.
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