mirror writing

(computing) character encoding

any of various writing systems claimed to predate Japan's adoption of Chinese characters and perpetuated by feudal scholars, but widely discredited by modern scholars

(possibly dialect, Tōhoku) any of various writing systems claimed to predate Japan's adoption of Chinese characters and perpetuated by feudal scholars, but widely discredited by modern scholars

rune

Empire of Japan (official name of Japan under the Constitution of the Empire of Japan, 1890-1947)

the Tangut script (a logographic writing system used for writing the Tangut language of the Western Xia Dynasty)

Cyrillization (putting text into the Cyrillic alphabet)

the Old Turkic script

(computing) character whose appearance may depend on a user's environment, or a character which may be absent from a user's environment, i.e. character set incompatibility