The Quote Each Item function processes a sequence of columns by enclosing each column name in single quote marks (for example, 'and', 'or', 'bin').
The result must be returned as either a Text literal, Text parameter or an unquoted String parameter.
When dragging Quote Each Item into a variable, the following tree element is created.
Variable Creation > Input > Variables: SQL Elements pane - Other > Quote Each Item
There are no special properties of the Quotes Each Item function.