MQL4 Reference Language Basics Syntax Identifiers
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IdentifiersIdentifiers are used as names of variables and functions. The length of the identifier can not exceed 63 characters. Characters allowed to be written in an identifier: figures 0-9, the Latin uppercase and lowercase letters a-z and A-Z, recognized as different characters, the underscore character (_).The first character can not be a digit. The identifier must not coincide with reserved word. Examples:
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