needlessness

necessary evil

(mathematics) quod erat demonstrandum (that which was to be proved)

Kyūjitai form of 読書 (“the act of reading”)

vertical writing

Alternative form of 横書き

kakizome, or the first calligraphy written at the beginning of a year

Alternative form of 書き順

(international law) protocol

"playful writing", a type of orthography expressing an author's cleverness or playful wit. One famous example is to write the expression 出でば (ideba) as 山上復有山者 (Man'yōshū volume 9, poem #1787)