An additional confusion is that you can use the single letters A, B, D, E,
F, ..., P, Q, S, T, U, ..., Z as names, but you can't use C or R.. The
create names facility will change these to C_ and R_.
This is presumably because of potential confusion with Columm and Row
designation.
--
David Biddulph

"Jon Peltier" wrote in message
...
You can use letters, numerals, a few punctuation marks (. and _), but
nothing that looks like an operator (+ - * /). It must begin with a letter
(or maybe an underscore), and it must not be confused with a cell address,
like A1, B2, etc.

- Jon
-------
Jon Peltier, Microsoft Excel MVP
Tutorials and Custom Solutions
Peltier Technical Services, Inc. - http://PeltierTech.com
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"Noreaster" wrote in message
...
What are invalid letter combo's for Insert/Name/Define Excel 2003.