Active addresses
A count of unique blockchain addresses meeting a data provider's activity rule during a stated period. That rule may include transfers or other ledger activity. Repeated activity by one address is counted once under the metric; an address count is not a count of people.
Example: A shop counts 40 loyalty cards used today. One shopper may use several cards, so 40 cards does not prove there were 40 people. Blockchain addresses have a similar measurement limit.