Characters are restricted to the lower ASCII range, and more specifically to Roman alphabet uppercase and lowercase letters, digits, and the underscore (_) character.
The Unicode character range is not supported.
A name cannot begin with a digit. Some tool implementations prepend an underscore (_) to a string if the user supplies a digit as the initial character.
I am working as VP Content Manager, responsible for content publishing, content development, and social relations. You can follow me on twitter @dbeniwal21
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