2.3 Identifiers

1. Identifiers are used as names.
   Syntax
   

2. identifier ::= identifier_letter {[underline] letter_or_digit}
   

3. letter_or_digit ::= identifier_letter | digit
   

   1. An identifier shall not be a reserved word.

1. All characters of an identifier are significant, including any underline character. Identifiers differing only in the use of corresponding upper and lower case letters are considered the same.
   Implementation Permissions
   
2. In a nonstandard mode, an implementation may support other upper/lower case equivalence rules for identifiers, to accommodate local conventions.
   Examples
   
3. Examples of identifiers:

4. Count      X    Get_Symbol   Ethelyn   Marion
   
   Snobol_4   X1   Page_Count    Store_Next_Item
   

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