In addition to the fields extracted from the data source, system fields are also produced by Qlik Sense. These all begin with "$" and can be displayed like ordinary fields in a visualization, such as a filter pane or a table. System fields are typically created during script execution, and are primarily used as an aid in app design.
Information note
System fields are not included in field lists in the assets panel or the Expression editor. If you want to use a system field, you need to reference it by typing it manually.
Example: =$Field
Available system fields
The following system fields are available:
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