The first character must be a Unicode letter (uppercase or lowercase) or underscore (_) character. Note that numbers cannot be used as the first character. The subsequent characters must be alphabet, numbers or underscores. The variable name must not be a reserved word.
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Effective:
_PageCount Part9 Number_Items
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Invalid example
99balloons // cannot begin with a number. Smith & Wesson // The ampersand (&) Character is not a valid character for variable names.
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