Coverage: amount of different and unique people reached by that location in a period of time.
Frequency: Average amount of times that those different and unique persons were in touch with that location in a period of time.
Total Impacts: Unique people times the frequency rate, it's equal to total impacts of a specific location in a period of time, this is also known as OTS or Opportunity to See). This information might vary according the data provider.
Total Universe: Amount of unique persons that are part of selected target or clusters.
Coverage Percentage: Total reached target percentage.
GRP: Gross Rating Point (Total Impacts / Total Universe x 100)