a letter or character (symbol for a sound or a word) / (linguistics) script, writing system / (specific to Japanese) a written mora, a kana / writing in general, written words

(computing) filesystem

(computing) File Transfer Protocol, FTP

the Cyrillic script

(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

(orthography, typography) a minuscule (lower-case letter)

an emoticon

Latin alphabet (the 26-letter alphabet)

hieroglyph, pictograph