(calligraphy and typography) "Edo characters", distinctive calligraphic (and later, typographic) styles that were born in the Edo period

delimiter; separator character

mirror writing

(computing) control character

transcription from audio

hieroglyph, pictograph

Latin alphabet (the 26-letter alphabet)

an emoticon

(computing) ghost character (kanji included in JIS X 0208 but of unknown origin)

corrupt characters or letters, especially from display or transfer through an inappropriate character set or encoding, e.g., •¶Žš‰»‚¯, which is a corruption of 文字化け