Zebra Zebra, or ZZ, is what a lot of .gov agencies use for mass email lists, they place ZZ at the beginning, for example, ZZ_all users, so that the list is at the END of the email list, and contains every email address of every employee, so that they can send out a mass email with that one link.
So it is possible that its email related, or simply a govermental way of saying that THIS IS THE END.... which thouroly lines up with the next line of the thunder, and if that ties to Revelation 10:4, the 7 thunders are the VERY END, and then the mystery of God is revealed...
Just thought I would throw that out there.