pg_enum

The pg_enum table contains entries matching enum types to their associated values and labels. The internal representation of a given enum value is actually the OID of its associated row in pg_enum. The OIDs for a particular enum type are guaranteed to be ordered in the way the type should sort, but there is no guarantee about the ordering of OIDs of unrelated enum types.

column	type	references	description
oid	oid		The object ID
enumtypid	oid	pgtype.oid	The OID of the pg_type entry owning this enum value
enumsortorder	float4		The sort position of this enum value within its enum type
enumlabel	name		The textual label for this enum value