This type of symbol designates the end of a block comment.

When the engine reads a token that is recognized as a line comment, the remaining characters on the line are automatically ignored by the parser.

This type of symbol designates the start of a block comment.

The End symbol is generated when the tokenizer reaches the end of the source text.

The Error symbol is a general-purpose means of representing characters that were not recognized by the tokenizer. In other words, when the tokenizer reads a series of characters that is not accepted by the DFA engine, a token of this type is created.

A normal non-terminal.

A normal terminal.

This Whitespace symbol is a special terminal that is automatically ignored by the parsing engine. Any text accepted as whitespace is considered to be inconsequential and "meaningless".