From wikipedia:
The Lakeview Baseball Club, which sits across Sheffield Avenue (right-field) from the stadium proudly displays a "calendar" demonstrating the Cubs' futility. The calendar is flanked by a sign that reads Eamus Catuli! which means "Go Cubs!" in Latin (catuli means "whelps" in Latin, the closest Latin translation to the word "Cubs"), and the calendar is labeled "AC," for "Anno Catuli," or "In the Year of the Cubs." The first two digits display the number of years since the Cubs' last division championship as of the end of the previous season (02; their last division championship was in 2003), the next two digits display the number of years since the Cubs' last trip to the World Series (60; their last Series was in 1945), and the last two digits display the number of years since their last World Series win (97; their last win was in 1908). It is not currently known what the LBC will do with the "calendar" if the Cubs reach 100 years without a World Series title.
You learn something new every day.