The correct name is Percent Variables, for example:
You can find the complete list in the following link:
Under User Guides and Release Notes select your version then click “… Online Help …“, following the latest version:
then Search “Percent Variables” or use the following path:
Often you think you can find the match with tables names or columns names in the database but it almost never works, I always suggest that you read the official documentation, it is always the best way.
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