Lucky Penny is an unlockable pickup in The Binding of Isaac, added in the Afterbirth DLC.
+1¢.
+1 luck.
This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this pickup for the previous Repentance version, check this page instead.
Donate 2¢ to the Greed Donation Machine.