it may be one of those things that's "unexplainable." i'm willing to bet that if you're saying "back in the day," you're referring to a time before any of us on this board were Deltas or maybe before we were born. having said that, there's a pretty good chance that none of us here can give you the answer you're seeking...either because we don't know, or we know but it's a secret.
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as an aside, I'm always amused by the questions folks ask about Delta. They never ask how we came up with the components of the Five Point Program Thrusts or if the five we have now were always in place. They always ask about some random stuff like where the call originated & what it means.
HC Sorors, HC?