ExoCiti

If you take a look at the post from 2 days ago you can see 3 different stencils on the wall. One of them is "Exociti", you can see some in the Cihangir Area as well. Especially in the Turnacıbaşı street but most of them have been "terminated" by now. Made with an A5 formated stencil, exociti would be a purposed mispelling of the word exocity. "Exo" meaning "outside", "city" meaning "city".
You can learn more about this group by visiting their website here.