core + attic (Attic Area): these terms have been either deprecated from the core or extentions, or removed from pending as not accepted into the full vocabulary.

breadcrumb

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

Thing > Property > breadcrumb

A set of links that can help a user understand and navigate a website hierarchy.

Usage: Between 250,000 and 500,000 domains
Values expected to be one of these types
BreadcrumbList
Text
Used on these types
WebPage

Schema Version 3.4