Variables start with Alpha
--found this via Google --
Naming Variables
Your naming convention should also cover variables. Aside from your naming convention, there are a few inherent rules you need to consider:
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A variable name must begin with an alphabetic character.
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Don't use the following special characters in a variable name: ., %, $, !, #, @, and $.
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Variable names must be unique. It really isn't as simple as all that, but for now, knowing that you can't give two variables in the same procedure the same name is sufficient.
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A variable name can consist of up to 255 characters.