3.37.2. General special characters
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### 3.37.2. General special characters

Name | Symbol | Function | Masked version
--- | --- | --- | ---
Open curly brackets | { | Delimits reference/variable names within a concatenated parameter value | `\{`
Close curly brackets | } | Delimits reference/variable names within a concatenated parameter value | `\}`
Single quote | ' | Delimits a verbatim area in a parameter | `\'`
Two single quotes | '' | Denotes an empty string | `\'\'`
Dollar | $ | Denotes a variable | `\$`
Equals | = | Denotes a referenced parameter | `\=`
Question mark | ? | Denotes a function | `?`
Backslash | \ | The escape symbol | `\\`

Table 3.4. Special symbols