 Katakana are commonly used on signs, advertisements, and hoardings (i.e., billboards), for example, "koko" ("here"), "gomi" ("trash"), or "megane" ("glasses").Words the writer wishes to emphasize in a sentence are also sometimes written in katakana, mirroring the European usage of italics.Pre–World War II official documents mix katakana and kanji in the same way that hiragana and kanji are mixed in modern Japanese texts, that is, katakana were used for "okurigana" and particles such as "wa" or "o".