Is Mine and Is Not Mine Operators
Use the "Is Mine" and "Is Not Mine" operators to search for records that do or do not belong to you when you perform an Advanced lookup.
"Is Mine" and "Is Not Mine" operators are used for all Team-based search fields, with the exception of names.
For example, if you have two levels of team, office and discipline, you can perform searches that automatically match the team of the employee logged in at the time.
Some examples are "team is mine", "office is mine" and "discipline is not mine."
These operators can be useful for establishing global searches and record level security.