This statistical property shows the ticket index of each analyzed ticket. The ticket index corresponds to ticket's position in the list of all possible combinations. For example in a 6/49 lottery there are 13,983,816 possible combinations starting with number combination 1-2-3-4-5-6 which has ticket index 1, then number combination 1-2-3-4-5-7 which has ticket index 2, up to the last possible combination 44-45-46-47-48-49 which has ticket index 13,983,816.
For example when analyzing the latest draw in Expert Lotto 6/49 Demo Lottery with winning numbers 23-29-36-42-44-47-[7] then column Ticket Index in e.g. Winning Numbers Properties window shows value 13,737,320. So this draw is very close to the end of the list of all possible combinations.
See also Ticket Index filter and Ticket Index Movement statistics.