ak

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ak

and ok (ɑk)
n. October. (Securities markets: options and futures trading.) When the oks expire on Friday, we’ll start looking at the dec index. I told him to buy the “aks,” or Octobers, and he looked at me like I was crazy!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.