gaiji (plural gaijis)
- A character that is valid in a given writing system, but that is not included in the present font and/or the present character encoding, and which therefore is displayed using an additional mechanism. Mutually distinct from tofu and from mojibake.
- ^ https://www.w3.org/International/articles/missing-char-glyph/index.en
- ^ http://glyphs.webfoot.com/blog/2011/03/19/gaiji/