This Easter Egg shows that Bruce Wayne has been doing his research on Superman, which was also teased in a comic book released just before Batman v Superman hits theaters.
Take a look at the tweets below that confirm the new Easter Egg for Batman v Superman: Dawn of Justice.
Now that Batman v Superman: Dawn of Justice is readily available on Blu-ray and DVD, fans are still discovering new details in this superhero adventure.
All of the main Batman v Superman are returning for Justice League, which is currently filming in the U.K. and set for release on November 17, 2017.