Site-Local (IPv6 Scope) definition in Computer Security terms:
Definition(s): This scope was intended to apply to all IPv6 networks or a single logical entity such as the network within an organization. Addresses with this scope start with FEC0::/10. They were intended not to be globally routable but potentially routed between subnets within an organization. Site local addresses have been deprecated and replaced with unique local addresses.
Source(s): NIST SP 800-119
reference: CSRC Glossary