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From: Paul B Levy <P.B.Levy@cs.bham.ac.uk>
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Subject: Re: \phi for the golden ratio?
Date: Sun, 06 Jun 2004 09:30:05 -0300
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[note from moderator: this will be the last of this thread...]

> So far, I have only met three real or complex numbers with universally
> accepted one-letter symbols:  \pi, e, i.  Have I missed something?

What about "r" (pronounced "rev"), denoting 2*pi, in the archaic but still
widely understood phrase "33 rpm record"?

A shame the Greeks chose pi rather than rev, for I think the latter is
more fundamental.

Paul