The catalog pg_operator stores information about operators. See CREATE

The catalog pg_shseclabel stores security labels on shared database objects. Security labels can be manipulated with the

The view pg_seclabels provides information about security labels. It as an easier-to-query version of the

The catalog pg_auth_members shows the membership relations between roles. Any non-circular set of relationships is allowed.

The catalog pg_transform stores information about transforms, which are a mechanism to adapt data types to procedural languages. See

The view pg_settings provides access to run-time parameters of the server. It is essentially an alternative interface to the

The catalog pg_namespace stores namespaces. A namespace is the structure underlying SQL schemas: each namespace can have a separate collection

The catalog pg_index contains part of the information about indexes. The rest is mostly in pg_class.

The catalog pg_pltemplate stores "template" information for procedural languages. A template for a language allows

The catalog pg_trigger stores triggers on tables and views. See CREATE