The System Data Dictionary is a set of predefined standard rules used to track every available lead in the current database. These standard rules are structured in a read-only format and can only be viewed.
Multiple approved rules from the System Data Dictionary can be used in Lead Routing Territory.

The System Data Dictionary contains some pre-defined data dictionaries on the leads. These include:
- Is a Duplicate Lead
Returns all the duplicate records.
- All Leads
Returns all the leads that are present in the system.
- Leads Matched to Accounts
Returns all the leads that are matched to accounts.
- Leads Not Matched to Accounts
Returns all the leads that are not matched to accounts.
- Leads With Public Email Domain
Returns all the leads that contain email addresses coming from public email domains.
The System Data Dictionary has a collection of more than 4000 commonly used public email addresses or email domains, and leads are filtered based on this collection.