Im not sure about the whole Katy Perry thing tbh cause I never seen that, dont usually watch any of these kinda things lol only way I even find out about them is mentioned on here so dunno really. I wsa trying to find out what symbols were too and as far as I have seen they are actually arameic but am not sure what they mean as for the main symbol used am not sure if thats the same as the other ones around the circle or clock as I think it must be, 12 hours on the clock so maybe the symbols are numbers although like I sad am not sure, maybe in the next few days or week there will be more information on the 12 monkeys wikia page. I think the snake eating its own tail has probably been used in many films or series before at least a few times. I cant wait to see how it all finally ends but they done a brilliant job with the series and I really didnt see that ending coming lol I knew Olivia still was probably up to something but didnt know what and it was totally unexpected, be interesting how it finishes! If only we had a time machine or one of those suits lol