A series of series can be used to represent series (festivals, podcasts) honored by the same award. For example, the Golden Globes for Podcasts and the multiple festival awards given by the European Festival Awards. There's also other potential uses suggested in STYLE-2235.

It would make sense to add two types of series for now, given this:

• "Series series" ("A series of series.") as the generic default
• "Series award" ("A series of series (such as podcasts or festivals) honoured by the same award.").