Working with Literal Values
Literal values enable you to manually enter string, Boolean, integer, or float values in your expression. For example, you can use a literal value to evaluate if a node's account type is equal to "Asset".
To add a literal value to an expression term, drag the string, Boolean, integer, or float object from the palette to the editor, or click and select one of those objects.
Note:
You can insert null or blank literal values in expressions. See Using Null and Blank Values in Expressions.