"] refers to a symbol with the specified name.
All symbols, whether explicitly entered using Symbol or not, have head Symbol.
_Symbol can be used as a pattern to represent any symbol.
The string "
" in Symbol["
"] must be an appropriate name for a symbol. It can contain any letters, letter-like forms, or digits, but cannot start with a digit.
"] creates a new symbol if none exists with the specified name.
A symbol such as x has a name "x".
"] creates a new symbol, it does so in the context specified by $Context.
See the Mathematica book: Section 2.3.4, Section 2.6.12, Section A.1.4.
See also: SymbolName, ToExpression, Unique, Remove.
Built-in constants and symbols without a value have head Symbol.
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