DC's Absolute Batman breaks down the alternate reason why Bruce Wayne chose bats as his symbol in this new universe (and it ...

Indeed, Bruce notes that bats number more unique species than any order of mammal apart from rodents. This flexibility is reflected in Bruce’s actions in the present day in Absolute Batman #4.

In those 12 calendars are twelve dates circled, with the last one marked by an actual Batman symbol. Then, you can translate those date numbers to an actual message, which is “HE WILL RETURN.” ...