core + meta (Meta Extension): terms used within schema.org for schema definitions.

worstRating

Canonical URL: http://schema.org/worstRating

Thing > Property > worstRating

The lowest value allowed in this rating system. If worstRating is omitted, 1 is assumed.

Usage: Between 100,000 and 250,000 domains
Values expected to be one of these types
Number
Text
Used on these types
Rating

Schema Version 3.2.1