Walls writing

The  is the unofficial name given to one of the two known writings existent in the universe of the Attack on Titan manga, along with the Titan Writing. It is the writing used by the inhabitants of the Walls, appearing on a variety of items, as well as in the inside covers of the manga.

Description
The Walls Writing seems to be the official and possibly only writing used by the inhabitants of the Walls, since all known objects with text printed on them are written in this language; with the only exception of some extraneous items labeled in Titan Writing found in Utgard Castle, and perhaps also Ilse Langnar's notebook. The writing is composed by short, straight strokes and sharp corners. Since most labels written in this script are horizontal, it is presumably read horizontally. Nothing else is known about this script.

Appearances

 * A signboard of the tavern where Levi and Kenny were fighting.
 * A newspaper that Armin was reading.
 * Bottles of Titan Serum.
 * A book that Frieda was reading to Historia.

Trivia

 * At first glance, the Walls Writing may look like unintelligible gibberish, although it is actually Japanese katakana turned upside down and messily written to make it difficult to read. By turning the text 180 degrees and some effort in the interpretation of the kanji, the writing can be directly translated to Japanese.
 * The texts seen in the newspaper Armin was reading and the book Frieda was reading to Historia are easter eggs added by Hajime Isayama's assistants which have nothing to do with the context of the story.
 * The inside covers of all manga volumes include pieces of Walls Writing revealing part of the lost history of humanity.