Unique reach and frequency metrics include: Unique users Avg. impr. freq. per user Avg. impr. freq. per user (7 days) Avg. impr. freq. per user (30 days) Frequency distribution 1+, 2+, 3+, 4+, 5+, 10+ https://support.google.com/google-ads/answer/2472714?hl=en