org-custom-properties

org-custom-properties is a variable defined in `org.el'.
Its value is

nil

Documentation:
List of properties (as strings) with a special meaning.
The default use of these custom properties is to let the user
hide them with `org-toggle-custom-properties-visibility'.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.3 of Emacs.