Symbol  | Description  | Example   | 
[ ]  | Optional item  | [Alias<alias name>]  | 
Array subscript  | matrix[ ]  | |
{ }  | Groups two or more mutually exclusive options or arguments when used with a pipe  | {While | Until}  | 
Defines array contents  | {0, 1, 2, 3}  | |
Delimiter of code block  | public ACJDesigner( ){ }  | |
|  | Separates mutually exclusive options or arguments in a group  | Exit {Do | For | Function | Sub}  | 
Java OR operator  | int length | 4  | |
< >  | Argument you must supply  | <expression to format>  | 
Delimiter in XML  | <xsd:sequence>  |