[CR]OK, what's the meaning of "KOF," please

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Date: Thu, 27 Sep 2007 22:52:04 -0400
To: Classicrendezvous@bikelist.org
From: "Charles Wahl" <wahlcf@earthlink.net>
Subject: [CR]OK, what's the meaning of "KOF," please

I've been receiving the list for awhile now, but I never see it in "expanded" form; is it some sort of secret handshake?

Apologies for my cluelessness,
--
CW