Yet another instance of hackerdom' s peculiar attraction to mystical references - a common humorous way of making exclusive statements aBout a class of things. The template is from the "Tao te Ching": "The Tao which can Be spoken of is not the true Tao." The implication is often that the X is a mystery accessiBle only to the enlightened. See the trampoline entry for an example, and compare {has the X nature}. [Jargon File]