This is the intId, an internal reference identifier UCS Manager assigns to this Policy record (an image-security policy controlling how strictly UCS Manager checks image signatures (e.g. Cisco-signed only vs. permissive) before letting an image be provisioned) for its own bookkeeping, separate from the user-facing name field. Admins never set this value themselves; it exists so UCS Manager's internal database can track and cross-reference this exact record even if its name or dn is later changed. It is typically an opaque numeric-looking string such as '4521' that has no meaning outside UCS Manager's own object store.